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REGULATORY MATTERS (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Tier 1 Leverage ratio [Abstract] |  |
Required capital conservation ratio | 2.50% | 2.50%
Tier 1 Leverage ratio, actual amount | $ 1,331,368 | $ 1,314,864
Tier 1 Leverage ratio, actual ratio | 9.09 | 10.16
Tier 1 leverage ratio for capital adequacy purposes, amount | $ 585,594 | $ 517,736
Tier 1 leverage ratio for capital adequacy purposes, ratio | 4.00 | 4.00
Tier 1 leverage capital to be well-capitalized under prompt corrective action, amount | $ 731,993 | $ 647,169
Tier 1 leverage capital to be well-capitalized under prompt corrective action, ratio | 5.00 | 5.00
Tier 1 risk-based capital [Abstract] |  |
Tier 1 risk-based capital, actual amount | $ 1,331,368 | $ 1,314,864
Tier 1 risk-based capital, actual ratio | 18.60 | 18.99
Tier 1 risk-based capital for capital adequacy purposes, amount | $ 429,559 | $ 415,472
Tier 1 risk-based capital for capital adequacy purposes, ratio | 6.00 | 6.00
Tier 1 risk-based capital for capital adequacy purposes plus capital conservation buffer, amount | $ 608,542 | $ 588,585
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 | $ 572,746 | $ 553,962
Tier 1 risk-based capital to be well-capitalized under prompt corrective action, ratio | 8.00 | 8.00
Total risk-based capital [Abstract] |  |
Total risk-based capital, actual amount | $ 1,380,458 | $ 1,375,704
Total risk-based capital, actual ratio | 19.28 | 19.87
Total risk-based capital for capital adequacy purposes, amount | $ 572,746 | $ 553,962
Total risk-based capita for capital adequacy purposes, ratio | 8.00 | 8.00
Total risk-based capital for capital adequacy purposes plus capital conservation buffer, amount | $ 751,729 | $ 727,075
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 | $ 715,932 | $ 692,453
Total risk based capital to be well-capitalized under prompt corrective action, ratio | 10.00 | 10.00
Common equity Tier 1 capital [Abstract] |  |
Common equity Tier 1 capital, actual amount | $ 1,331,259 | $ 1,239,754
Common equity Tier 1 capital, actual ratio | 18.60 | 17.90
Common equity Tier 1 capital for capital adequacy purposes, amount | $ 322,169 | $ 311,604
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 | $ 501,152 | $ 484,717
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 | $ 465,356 | $ 450,094
Common equity Tier 1 capital to be well-capitalized under prompt corrective action, ratio | 6.50% | 6.50%
Community Bank, N.A. [Member] |  |
Tier 1 Leverage ratio [Abstract] |  |
Tier 1 Leverage ratio, actual amount | $ 1,058,091 | $ 1,028,285
Tier 1 Leverage ratio, actual ratio | 7.26 | 7.98
Tier 1 leverage ratio for capital adequacy purposes, amount | $ 582,631 | $ 515,552
Tier 1 leverage ratio for capital adequacy purposes, ratio | 4.00 | 4.00
Tier 1 leverage capital to be well-capitalized under prompt corrective action, amount | $ 728,289 | $ 644,440
Tier 1 leverage capital to be well-capitalized under prompt corrective action, ratio | 5.00 | 5.00
Tier 1 risk-based capital [Abstract] |  |
Tier 1 risk-based capital, actual amount | $ 1,058,091 | $ 1,028,285
Tier 1 risk-based capital, actual ratio | 14.92 | 14.98
Tier 1 risk-based capital for capital adequacy purposes, amount | $ 425,393 | $ 411,880
Tier 1 risk-based capital for capital adequacy purposes, ratio | 6.00 | 6.00
Tier 1 risk-based capital for capital adequacy purposes plus capital conservation buffer, amount | $ 602,640 | $ 583,497
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 | $ 567,190 | $ 549,174
Tier 1 risk-based capital to be well-capitalized under prompt corrective action, ratio | 8.00 | 8.00
Total risk-based capital [Abstract] |  |
Total risk-based capital, actual amount | $ 1,107,181 | $ 1,089,125
Total risk-based capital, actual ratio | 15.62 | 15.87
Total risk-based capital for capital adequacy purposes, amount | $ 567,190 | $ 549,174
Total risk-based capita for capital adequacy purposes, ratio | 8.00 | 8.00
Total risk-based capital for capital adequacy purposes plus capital conservation buffer, amount | $ 744,437 | $ 720,791
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 | $ 708,988 | $ 686,467
Total risk based capital to be well-capitalized under prompt corrective action, ratio | 10.00 | 10.00
Common equity Tier 1 capital [Abstract] |  |
Common equity Tier 1 capital, actual amount | $ 1,057,982 | $ 1,028,175
Common equity Tier 1 capital, actual ratio | 14.92 | 14.98
Common equity Tier 1 capital for capital adequacy purposes, amount | $ 319,045 | $ 308,910
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 | $ 496,292 | $ 480,527
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 | $ 460,842 | $ 446,204
Common equity Tier 1 capital to be well-capitalized under prompt corrective action, ratio | 6.50% | 6.50%

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