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REGULATORY MATTERS (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Tier 1 Leverage ratio [Abstract]    
Tier 1 Leverage ratio, actual amount $ 995,860 $ 858,347
Tier 1 Leverage ratio, actual ratio 10.00% 10.55%
Tier 1 leverage ratio for capital adequacy purposes, amount $ 398,183 $ 325,438
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 $ 497,729 $ 406,798
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 $ 995,860 $ 858,347
Tier 1 risk-based capital, actual ratio 16.64% 18.10%
Tier 1 risk-based capital for capital adequacy purposes, amount $ 358,988 $ 284,583
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 $ 433,777 $ 314,228
Tier 1 risk-based capital for capital adequacy purposes plus capital conservation buffer, ratio 7.25% 6.625%
Tier 1 risk based capital to be well-capitalized under prompt corrective action, amount $ 478,651 $ 379,445
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 $ 1,043,910 $ 905,996
Total risk-based capital, actual ratio 17.45% 19.10%
Total risk-based capital for capital adequacy purposes, amount $ 478,651 $ 379,445
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 $ 553,440 $ 409,089
Total risk-based capita for capital adequacy purposes plus capital conservation buffer, ratio 9.25% 8.625%
Total risk based capital to be well-capitalized under prompt corrective action, amount $ 598,314 $ 474,306
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 $ 876,685 $ 759,199
Common equity Tier 1 capital, actual ratio 14.65% 16.01%
Common equity Tier 1 capital for capital adequacy purposes, amount $ 269,241 $ 213,438
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 $ 344,030 $ 243,082
Common equity Tier 1 capital for capital adequacy purposes plus capital conservation buffer, ratio 5.75% 5.125%
Common equity Tier 1 capital to be well-capitalized under prompt corrective action, amount $ 388,904 $ 308,299
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 $ 859,538 $ 672,633
Tier 1 Leverage ratio, actual ratio 8.71% 8.30%
Tier 1 leverage ratio for capital adequacy purposes, amount $ 394,981 $ 324,080
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 $ 493,726 $ 405,099
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 $ 859,538 $ 672,633
Tier 1 risk-based capital, actual ratio 14.50% 14.28%
Tier 1 risk-based capital for capital adequacy purposes, amount $ 355,641 $ 282,662
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 $ 429,733 $ 312,106
Tier 1 risk-based capital for capital adequacy purposes plus capital conservation buffer, ratio 7.25% 6.625%
Tier 1 risk based capital to be well-capitalized under prompt corrective action, amount $ 474,188 $ 376,883
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 $ 907,588 $ 720,282
Total risk-based capital, actual ratio 15.31% 15.29%
Total risk-based capital for capital adequacy purposes, amount $ 474,188 $ 376,883
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 $ 548,280 $ 406,327
Total risk-based capita for capital adequacy purposes plus capital conservation buffer, ratio 9.25% 8.625%
Total risk based capital to be well-capitalized under prompt corrective action, amount $ 592,736 $ 471,104
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 $ 859,483 $ 672,578
Common equity Tier 1 capital, actual ratio 14.50% 14.28%
Common equity Tier 1 capital for capital adequacy purposes, amount $ 266,731 $ 211,997
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 $ 340,823 $ 241,441
Common equity Tier 1 capital for capital adequacy purposes plus capital conservation buffer, ratio 5.75% 5.125%
Common equity Tier 1 capital to be well-capitalized under prompt corrective action, amount $ 385,278 $ 306,217
Common equity Tier 1 capital to be well-capitalized under prompt corrective action, ratio 6.50% 6.50%