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REGULATORY MATTERS (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Tier 1 Leverage ratio [Abstract] |  |
Tier 1 Leverage ratio, actual amount | $ 788,717 | $ 705,163
Tier 1 Leverage ratio, actual ratio | 10.32% | 9.96%
Tier 1 leverage ratio for capital adequacy purposes, amount | $ 305,761 | $ 283,255
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 | $ 382,201 | $ 354,069
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 | $ 788,717 | $ 705,163
Tier 1 risk-based capital, actual ratio | 17.09% | 17.61%
Tier 1 risk-based capital for capital adequacy purposes, amount | $ 276,886 | $ 160,214
Tier 1 risk-based capital for capital adequacy purposes, ratio | 6.00% | 4.00%
Tier 1 risk based capital to be well-capitalized under prompt corrective action, amount | $ 369,181 | $ 240,321
Tier 1 risk-based capital to be well-capitalized under prompt corrective action, ratio | 8.00% | 6.00%
Total risk-based capital [Abstract] |  |
Total risk-based capital, actual amount | $ 834,539 | $ 750,942
Total risk-based capital, actual ratio | 18.08% | 18.75%
Total risk-based capital for capital adequacy purposes, amount | $ 369,181 | $ 320,428
Total risk-based capita for capital adequacy purposes, ratio | 8.00% | 8.00%
Total risk based capital to be well-capitalized under prompt corrective action, amount | $ 461,477 | $ 400,535
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 | $ 689,528 |
Common equity Tier 1 capital, actual ratio | 14.94% |
Common equity Tier 1 capital for capital adequacy purposes, amount | $ 207,664 |
Common equity Tier 1 capital for capital adequacy purposes, ratio | 4.50% |
Common equity Tier 1 capital to be well-capitalized under prompt corrective action, amount | $ 299,960 |
Common equity Tier 1 capital to be well-capitalized under prompt corrective action, ratio | 6.50% |
Community Bank, N.A. [Member] |  |
Tier 1 Leverage ratio [Abstract] |  |
Tier 1 Leverage ratio, actual amount | $ 673,443 | $ 584,014
Tier 1 Leverage ratio, actual ratio | 8.88% | 8.27%
Tier 1 leverage ratio for capital adequacy purposes, amount | $ 303,256 | $ 282,517
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 | $ 379,070 | $ 353,146
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 | $ 673,443 | $ 584,014
Tier 1 risk-based capital, actual ratio | 14.65% | 14.64%
Tier 1 risk-based capital for capital adequacy purposes, amount | $ 275,739 | $ 159,603
Tier 1 risk-based capital for capital adequacy purposes, ratio | 6.00% | 4.00%
Tier 1 risk based capital to be well-capitalized under prompt corrective action, amount | $ 367,652 | $ 239,404
Tier 1 risk-based capital to be well-capitalized under prompt corrective action, ratio | 8.00% | 6.00%
Total risk-based capital [Abstract] |  |
Total risk-based capital, actual amount | $ 719,265 | $ 629,793
Total risk-based capital, actual ratio | 15.65% | 15.78%
Total risk-based capital for capital adequacy purposes, amount | $ 367,652 | $ 319,206
Total risk-based capita for capital adequacy purposes, ratio | 8.00% | 8.00%
Total risk based capital to be well-capitalized under prompt corrective action, amount | $ 459,565 | $ 399,007
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 | $ 673,326 |
Common equity Tier 1 capital, actual ratio | 14.65% |
Common equity Tier 1 capital for capital adequacy purposes, amount | $ 206,804 |
Common equity Tier 1 capital for capital adequacy purposes, ratio | 4.50% |
Common equity Tier 1 capital to be well-capitalized under prompt corrective action, amount | $ 298,717 |
Common equity Tier 1 capital to be well-capitalized under prompt corrective action, ratio | 6.50% |

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- Definition The minimum Total risk based capital ratio (total 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=35709795&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=35709795&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=35709795&loc=SL5958570-112826 + 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=35709795&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=35709795&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=35709795&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=35709795&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=35709795&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=35709795&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=35709795&loc=d3e65071-112826 + Details
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