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REGULATORY MATTERS (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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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%

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- Definition The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition Total Capital divided by risk weighted assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 + Details
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- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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- Definition The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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