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REGULATORY MATTERS (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Compliance with regulatory capital requirements under banking regulations    
Undivided profits legally available for the payments of dividends $ 195,700  
Tier 1 Leverage ratio    
Required capital conservation ratio 2.50% 2.50%
Tier 1 risk-based capital    
Tier 1 risk-based capital for capital adequacy purposes plus capital conservation buffer, ratio 8.50%  
Total risk-based capital    
Total risk-based capita for capital adequacy purposes plus capital conservation buffer, ratio 10.50%  
Common equity Tier 1 capital    
Common equity Tier 1 capital for capital adequacy purposes plus capital conservation buffer, ratio 7.00%  
Community Financial System, Inc.    
Tier 1 Leverage ratio    
Tier 1 Leverage ratio, actual amount $ 1,454,209 $ 1,402,188
Tier 1 Leverage ratio, actual ratio 0.0919 0.0934
Tier 1 leverage ratio for capital adequacy purposes, amount $ 633,020 $ 600,442
Tier 1 leverage ratio for capital adequacy purposes, ratio 0.04 0.04
Tier 1 leverage capital to be well-capitalized under prompt corrective action, amount $ 791,275 $ 750,553
Tier 1 leverage capital to be well-capitalized under prompt corrective action, ratio 0.05 0.05
Tier 1 risk-based capital    
Tier 1 risk-based capital, actual amount $ 1,454,209 $ 1,402,188
Tier 1 risk-based capital, actual ratio 0.1423 0.1476
Tier 1 risk-based capital for capital adequacy purposes, amount $ 613,106 $ 570,158
Tier 1 risk-based capital for capital adequacy purposes, ratio 0.06 0.06
Tier 1 risk-based capital for capital adequacy purposes plus capital conservation buffer, amount $ 868,566 $ 807,723
Tier 1 risk-based capital for capital adequacy purposes plus capital conservation buffer, ratio 8.50% 8.50%
Tier 1 risk based capital to be well-capitalized under prompt corrective action, amount $ 817,474 $ 760,210
Tier 1 risk-based capital to be well-capitalized under prompt corrective action, ratio 0.08 0.08
Total risk-based capital    
Total risk-based capital, actual amount $ 1,533,798 $ 1,468,920
Total risk-based capital, actual ratio 0.1501 0.1546
Total risk-based capital for capital adequacy purposes, amount $ 817,474 $ 760,210
Total risk-based capita for capital adequacy purposes, ratio 0.08 0.08
Total risk-based capital for capital adequacy purposes plus capital conservation buffer, amount $ 1,072,935 $ 997,776
Total risk-based capita for capital adequacy purposes plus capital conservation buffer, ratio 10.50% 10.50%
Total risk based capital to be well-capitalized under prompt corrective action, amount $ 1,021,843 $ 950,263
Total risk based capital to be well-capitalized under prompt corrective action, ratio 0.10 0.10
Common equity Tier 1 capital    
Common equity Tier 1 capital, actual amount $ 1,454,067 $ 1,402,042
Common equity Tier 1 capital, actual ratio 0.1423 0.1475
Common equity Tier 1 capital for capital adequacy purposes, amount $ 459,829 $ 427,618
Common equity Tier 1 capital for capital adequacy purposes, ratio 4.50% 4.50%
Common equity Tier 1 capital for capital adequacy purposes plus capital conservation buffer, amount $ 715,290 $ 665,184
Common equity Tier 1 capital for capital adequacy purposes plus capital conservation buffer, ratio 7.00% 7.00%
Common equity Tier 1 capital to be well-capitalized under prompt corrective action, amount $ 664,198 $ 617,671
Common equity Tier 1 capital to be well-capitalized under prompt corrective action, ratio 6.50% 6.50%
Community Bank, N.A.    
Tier 1 Leverage ratio    
Tier 1 Leverage ratio, actual amount $ 1,210,171 $ 1,139,569
Tier 1 Leverage ratio, actual ratio 0.0769 0.077
Tier 1 leverage ratio for capital adequacy purposes, amount $ 629,589 $ 591,877
Tier 1 leverage ratio for capital adequacy purposes, ratio 0.04 0.04
Tier 1 leverage capital to be well-capitalized under prompt corrective action, amount $ 786,986 $ 739,846
Tier 1 leverage capital to be well-capitalized under prompt corrective action, ratio 0.05 0.05
Tier 1 risk-based capital    
Tier 1 risk-based capital, actual amount $ 1,210,171 $ 1,139,569
Tier 1 risk-based capital, actual ratio 0.1196 0.1211
Tier 1 risk-based capital for capital adequacy purposes, amount $ 607,244 $ 564,590
Tier 1 risk-based capital for capital adequacy purposes, ratio 0.06 0.06
Tier 1 risk-based capital for capital adequacy purposes plus capital conservation buffer, amount $ 860,262 $ 799,835
Tier 1 risk-based capital for capital adequacy purposes plus capital conservation buffer, ratio 8.50% 8.50%
Tier 1 risk based capital to be well-capitalized under prompt corrective action, amount $ 809,658 $ 752,786
Tier 1 risk-based capital to be well-capitalized under prompt corrective action, ratio 0.08 0.08
Total risk-based capital    
Total risk-based capital, actual amount $ 1,289,760 $ 1,206,301
Total risk-based capital, actual ratio 0.1274 0.1282
Total risk-based capital for capital adequacy purposes, amount $ 809,658 $ 752,786
Total risk-based capita for capital adequacy purposes, ratio 0.08 0.08
Total risk-based capital for capital adequacy purposes plus capital conservation buffer, amount $ 1,062,677 $ 988,032
Total risk-based capita for capital adequacy purposes plus capital conservation buffer, ratio 10.50% 10.50%
Total risk based capital to be well-capitalized under prompt corrective action, amount $ 1,012,073 $ 940,983
Total risk based capital to be well-capitalized under prompt corrective action, ratio 0.10 0.10
Common equity Tier 1 capital    
Common equity Tier 1 capital, actual amount $ 1,210,029 $ 1,139,423
Common equity Tier 1 capital, actual ratio 0.1196 0.1211
Common equity Tier 1 capital for capital adequacy purposes, amount $ 455,433 $ 423,442
Common equity Tier 1 capital for capital adequacy purposes, ratio 4.50% 4.50%
Common equity Tier 1 capital for capital adequacy purposes plus capital conservation buffer, amount $ 708,451 $ 658,688
Common equity Tier 1 capital for capital adequacy purposes plus capital conservation buffer, ratio 7.00% 7.00%
Common equity Tier 1 capital to be well-capitalized under prompt corrective action, amount $ 657,847 $ 611,639
Common equity Tier 1 capital to be well-capitalized under prompt corrective action, ratio 6.50% 6.50%