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Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On April 29, 2026, the reporting person's phantom stock units were settled for 9 shares of Community Financial System, Inc. common stock, and .4418 shares were settled in cash at the price of $63.17 per share."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"LTIP\"). 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Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Includes 54.1540 units of phantom stock acquired on April 10, 2026 under the LTIP's dividend reinvestment feature."}],"balance_after":7180.8232,"derivative":{"underlying":"Common Stock","underlying_shares":9},"source":{"system":"sec-edgar","filing":"0000723188-26-000089","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/723188/000072318826000089/form4.xml","form_type":"4"}},{"id":796362,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50447,"kind":"person","name":"Pecor Raymond C III","position":1,"cik":"0001475265","reported_name":"Pecor Raymond C III","relationship":{"director":true}}],"security":"Common Stock","published_at":"2026-05-01T20:28:05.000Z","date":"2026-04-29","kind":"exercise","planned":false,"acquired":true,"shares":9,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On April 29, 2026, the reporting person's phantom stock units were settled for 9 shares of Community Financial System, Inc. common stock, and .4418 shares were settled in cash at the price of $63.17 per share."}],"balance_after":11448.221,"source":{"system":"sec-edgar","filing":"0000723188-26-000089","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/723188/000072318826000089/form4.xml","form_type":"4"}},{"id":831626,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50447,"kind":"person","name":"Pecor Raymond C III","position":1,"cik":"0001475265","reported_name":"Pecor Raymond C III","relationship":{"director":true}}],"security":"Phantom Stock (Deferred Stock Units)","published_at":"2026-03-23T15:09:40.000Z","date":"2026-03-19","kind":"exercise","planned":false,"acquired":false,"shares":1254,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"LTIP\"). Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On March 19, 2026, the reporting person's phantom stock units were settled for 1,254 shares of Community Financial System, Inc. common stock, and .5514 shares were settled in cash at the price of $55.61 per share."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"LTIP\"). Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"LTIP\"). 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Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F8","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"LTIP\"). Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F8","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"LTIP\"). 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Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F8","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"Plan\").  Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F8","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"Plan\").  Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F9","text":"Includes 43.1123, 52.3854, 45.0833, and 44.7223 units of phantom stock acquired as dividend equivalents on April 10, 2024, July 10, 2024, October 10, 2024, and January 10, 2025, respectively, under the Plan."}],"balance_after":6949.7799,"derivative":{"underlying":"Common Stock","underlying_shares":1225},"source":{"system":"sec-edgar","filing":"0001127602-25-010091","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/723188/000112760225010091/form4.xml","form_type":"4"}},{"id":1324928,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50447,"kind":"person","name":"Pecor Raymond C III","position":1,"cik":"0001475265","reported_name":"Pecor Raymond C III","relationship":{"director":true}}],"security":"Phantom Stock (Deferred Compensation)","published_at":"2024-12-20T16:26:54.000Z","date":"2024-12-19","kind":"grant","planned":false,"acquired":true,"shares":375.6329,"price":61.23,"value":23000.002467,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each unit of phantom stock is the economic equivalent of one share of Community Financial System, Inc. common stock.  The units of phantom stock relating to the Deferred Compensation Plan will be settled in Community Financial System, Inc. common stock at future dates selected by the reporting person."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each unit of phantom stock is the economic equivalent of one share of Community Financial System, Inc. common stock.  The units of phantom stock relating to the Deferred Compensation Plan will be settled in Community Financial System, Inc. common stock at future dates selected by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each unit of phantom stock is the economic equivalent of one share of Community Financial System, Inc. common stock.  The units of phantom stock relating to the Deferred Compensation Plan will be settled in Community Financial System, Inc. common stock at future dates selected by the reporting person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 67.8293, 66.08, and 60.6914 units of phantom stock acquired on April 10, 2024, July 10, 2024, and October 10, 2024, respectively, under the dividend reinvestment feature."}],"balance_after":8451.9553,"derivative":{"underlying":"Common Stock","underlying_shares":375.6329},"source":{"system":"sec-edgar","filing":"0001127602-24-029841","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/723188/000112760224029841/form4.xml","form_type":"4"}},{"id":1400627,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50447,"kind":"person","name":"Pecor Raymond C III","position":1,"cik":"0001475265","reported_name":"Pecor Raymond C III","relationship":{"director":true}}],"security":"Phantom Stock (Deferred Compensation)","published_at":"2024-09-24T19:42:09.000Z","date":"2024-09-19","kind":"grant","planned":false,"acquired":true,"shares":395.4608,"price":58.16,"value":23000.000128,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each unit of phantom stock is the economic equivalent of one share of Community Bank System, Inc. common stock.  The units of phantom stock relating to the Deferred Compensation Plan will be settled in Community Bank System, Inc. common stock at future dates selected by the reporting person."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each unit of phantom stock is the economic equivalent of one share of Community Bank System, Inc. common stock.  The units of phantom stock relating to the Deferred Compensation Plan will be settled in Community Bank System, Inc. common stock at future dates selected by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each unit of phantom stock is the economic equivalent of one share of Community Bank System, Inc. common stock.  The units of phantom stock relating to the Deferred Compensation Plan will be settled in Community Bank System, Inc. common stock at future dates selected by the reporting person."}],"balance_after":7881.7217,"derivative":{"underlying":"Common Stock","underlying_shares":395.4608},"source":{"system":"sec-edgar","filing":"0001127602-24-024354","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/723188/000112760224024354/form4.xml","form_type":"4"}},{"id":1472619,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50447,"kind":"person","name":"Pecor Raymond C III","position":1,"cik":"0001475265","reported_name":"Pecor Raymond C III","relationship":{"director":true}}],"security":"Phantom Stock (Deferred Compensation)","published_at":"2024-06-21T18:04:26.000Z","date":"2024-06-20","kind":"grant","planned":false,"acquired":true,"shares":479.7865,"price":44.03,"value":21124.999595,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each unit of phantom stock is the economic equivalent of one share of Community Bank System, Inc. common stock.  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The units of phantom stock relating to the Deferred Compensation Plan will be settled in Community Bank System, Inc. common stock at future dates selected by the reporting person."}],"balance_after":7486.2609,"derivative":{"underlying":"Common Stock","underlying_shares":479.7865},"source":{"system":"sec-edgar","filing":"0001127602-24-019115","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/723188/000112760224019115/form4.xml","form_type":"4"}},{"id":1565482,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50447,"kind":"person","name":"Pecor Raymond C III","position":1,"cik":"0001475265","reported_name":"Pecor Raymond C III","relationship":{"director":true}}],"security":"Phantom Stock (Deferred Stock Units)","published_at":"2024-03-21T17:43:09.000Z","date":"2024-03-19","kind":"grant","planned":false,"acquired":true,"shares":1395,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F8","text":"The reporting person has received deferred stock units under the Community Bank System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"Plan\").  Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Bank System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F8","text":"The reporting person has received deferred stock units under the Community Bank System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"Plan\").  Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Bank System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F8","text":"The reporting person has received deferred stock units under the Community Bank System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"Plan\").  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The units of phantom stock relating to the Deferred Compensation Plan will be settled in Community Bank System, Inc. common stock at future dates selected by the reporting person."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each unit of phantom stock is the economic equivalent of one share of Community Bank System, Inc. common stock.  The units of phantom stock relating to the Deferred Compensation Plan will be settled in Community Bank System, Inc. common stock at future dates selected by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each unit of phantom stock is the economic equivalent of one share of Community Bank System, Inc. common stock.  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