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REGULATORY MATTERS (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Tier 1 Leverage ratio [Abstract] |  |
Tier 1 Leverage ratio, actual amount | $ 1,148,336 | $ 1,093,166
Tier 1 Leverage ratio, actual ratio | 10.80% | 11.08%
Tier 1 leverage ratio for capital adequacy purposes, amount | $ 425,431 | $ 394,700
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 | $ 531,788 | $ 493,375
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 | $ 1,148,336 | $ 1,093,166
Tier 1 risk-based capital, actual ratio | 17.23% | 18.23%
Tier 1 risk-based capital for capital adequacy purposes, amount | $ 399,834 | $ 359,747
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 | $ 566,432 | $ 472,168
Tier 1 risk-based capital for capital adequacy purposes plus capital conservation buffer, ratio | 8.50% | 7.875%
Tier 1 risk based capital to be well-capitalized under prompt corrective action, amount | $ 533,112 | $ 479,662
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 | $ 1,198,724 | $ 1,142,927
Total risk-based capital, actual ratio | 17.99% | 19.06%
Total risk-based capital for capital adequacy purposes, amount | $ 533,112 | $ 479,662
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 | $ 699,710 | $ 592,083
Total risk-based capita for capital adequacy purposes plus capital conservation buffer, ratio | 10.50% | 9.875%
Total risk based capital to be well-capitalized under prompt corrective action, amount | $ 666,390 | $ 599,578
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 | $ 1,073,281 | $ 998,111
Common equity Tier 1 capital, actual ratio | 16.11% | 16.65%
Common equity Tier 1 capital for capital adequacy purposes, amount | $ 299,876 | $ 269,810
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 | $ 466,473 | $ 382,231
Common equity Tier 1 capital for capital adequacy purposes plus capital conservation buffer, ratio | 7.00% | 6.375%
Common equity Tier 1 capital to be well-capitalized under prompt corrective action, amount | $ 433,154 | $ 389,726
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 | $ 910,364 | $ 912,995
Tier 1 Leverage ratio, actual ratio | 8.61% | 9.32%
Tier 1 leverage ratio for capital adequacy purposes, amount | $ 422,882 | $ 391,953
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 | $ 528,603 | $ 489,941
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 | $ 910,364 | $ 912,995
Tier 1 risk-based capital, actual ratio | 13.79% | 15.35%
Tier 1 risk-based capital for capital adequacy purposes, amount | $ 396,064 | $ 356,973
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 | $ 561,091 | $ 468,527
Tier 1 risk-based capital for capital adequacy purposes plus capital conservation buffer, ratio | 8.50% | 7.875%
Tier 1 risk based capital to be well-capitalized under prompt corrective action, amount | $ 528,086 | $ 475,964
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 | $ 960,752 | $ 962,756
Total risk-based capital, actual ratio | 14.55% | 16.18%
Total risk-based capital for capital adequacy purposes, amount | $ 528,086 | $ 475,964
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 | $ 693,113 | $ 587,518
Total risk-based capita for capital adequacy purposes plus capital conservation buffer, ratio | 10.50% | 9.875%
Total risk based capital to be well-capitalized under prompt corrective action, amount | $ 660,107 | $ 594,955
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 | $ 910,309 | $ 912,940
Common equity Tier 1 capital, actual ratio | 13.79% | 15.35%
Common equity Tier 1 capital for capital adequacy purposes, amount | $ 297,048 | $ 267,730
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 | $ 462,075 | $ 379,284
Common equity Tier 1 capital for capital adequacy purposes plus capital conservation buffer, ratio | 7.00% | 6.375%
Common equity Tier 1 capital to be well-capitalized under prompt corrective action, amount | $ 429,070 | $ 386,721
Common equity Tier 1 capital to be well-capitalized under prompt corrective action, ratio | 6.50% | 6.50%

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- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Tier 1 capital divided by risk weighted assets as defined by regulations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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