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LOANS, Credit Quality By Past Due Status (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Aged analysis of the company's loans [Abstract] |  |  |
Total Loans |  | $ 4,313,547 | $ 4,236,206
Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Nonaccrual |  | 20,504 | 17,676
Total Past Due |  | 46,638 | 54,940
Current |  | 4,028,757 | 3,908,458
Total Loans |  | 4,075,395 | 3,963,398
Legacy Loans [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Past Due |  | 24,258 | 34,436
Legacy Loans [Member] | 90+ Days Past Due [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + Days Past Due and Still Accruing |  | 1,876 | 2,828
Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Nonaccrual |  | 2,629 | 3,055
Total Past Due |  | 4,888 | 6,721
Current |  | 228,589 | 260,775
Acquired Impaired | [1] | 4,675 | 5,312
Total Loans |  | 238,152 | 272,808
Acquired Loans [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Past Due |  | 2,060 | 3,388
Acquired Loans [Member] | 90+ Days Past Due [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + Days Past Due and Still Accruing |  | 199 | 278
Consumer Mortgage [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Loans |  | 1,562,089 | 1,544,401
Consumer Mortgage [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Loans |  | 59,773 | 68,983
Business Lending [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Loans |  | 1,288,772 | 1,262,484
Business Lending [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Loans |  | 1,167,952 | 1,124,594
Business Lending [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Loans |  | 120,820 | 137,890
Consumer Indirect [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Loans |  | 872,414 | 832,745
Consumer Indirect [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Loans |  | 574 | 1,223
Consumer Direct [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Loans |  | 180,618 | 178,585
Consumer Direct [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Loans |  | 3,861 | 5,443
Home Equity [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Loans |  | 292,322 | 283,073
Home Equity [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Loans |  | 53,124 | 59,269
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Loans |  | 1,621,862 | 1,613,384
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Nonaccrual |  | 12,108 | 13,201
Total Past Due |  | 23,574 | 29,344
Current |  | 1,538,515 | 1,515,057
Total Loans |  | 1,562,089 | 1,544,401
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Legacy Loans [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Past Due |  | 10,115 | 13,978
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Legacy Loans [Member] | 90+ Days Past Due [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + Days Past Due and Still Accruing |  | 1,351 | 2,165
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Nonaccrual |  | 1,473 | 2,122
Total Past Due |  | 2,874 | 4,246
Current |  | 56,899 | 64,737
Acquired Impaired | [1] | 0 | 0
Total Loans |  | 59,773 | 68,983
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Acquired Loans [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Past Due |  | 1,271 | 1,892
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Acquired Loans [Member] | 90+ Days Past Due [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + Days Past Due and Still Accruing |  | 130 | 232
Commercial Portfolio Segment [Member] | Business Lending [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Loans |  | 1,288,772 | 1,262,484
Commercial Portfolio Segment [Member] | Business Lending [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Nonaccrual |  | 6,402 | 2,291
Total Past Due |  | 8,724 | 9,379
Current |  | 1,159,228 | 1,115,215
Total Loans |  | 1,167,952 | 1,124,594
Commercial Portfolio Segment [Member] | Business Lending [Member] | Legacy Loans [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Past Due |  | 2,187 | 6,738
Commercial Portfolio Segment [Member] | Business Lending [Member] | Legacy Loans [Member] | 90+ Days Past Due [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + Days Past Due and Still Accruing |  | 135 | 350
Commercial Portfolio Segment [Member] | Business Lending [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Nonaccrual |  | 710 | 489
Total Past Due |  | 902 | 1,097
Current |  | 115,243 | 131,481
Acquired Impaired | [1] | 4,675 | 5,312
Total Loans |  | 120,820 | 137,890
Commercial Portfolio Segment [Member] | Business Lending [Member] | Acquired Loans [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Past Due |  | 192 | 608
Commercial Portfolio Segment [Member] | Business Lending [Member] | Acquired Loans [Member] | 90+ Days Past Due [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + Days Past Due and Still Accruing |  | 0 | 0
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Loans |  | 872,988 | 833,968
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Nonaccrual |  | 0 | 10
Total Past Due |  | 9,843 | 10,621
Current |  | 862,571 | 822,124
Total Loans |  | 872,414 | 832,745
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Legacy Loans [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Past Due |  | 9,785 | 10,529
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Legacy Loans [Member] | 90+ Days Past Due [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + Days Past Due and Still Accruing |  | 58 | 82
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Nonaccrual |  | 0 | 0
Total Past Due |  | 25 | 40
Current |  | 549 | 1,183
Acquired Impaired | [1] | 0 | 0
Total Loans |  | 574 | 1,223
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Acquired Loans [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Past Due |  | 25 | 40
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Acquired Loans [Member] | 90+ Days Past Due [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + Days Past Due and Still Accruing |  | 0 | 0
Consumer Portfolio Segment [Member] | Consumer Direct [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Loans |  | 184,479 | 184,028
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Nonaccrual |  | 1 | 2
Total Past Due |  | 1,190 | 1,427
Current |  | 179,428 | 177,158
Total Loans |  | 180,618 | 178,585
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Legacy Loans [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Past Due |  | 1,148 | 1,389
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Legacy Loans [Member] | 90+ Days Past Due [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + Days Past Due and Still Accruing |  | 41 | 36
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Nonaccrual |  | 14 | 18
Total Past Due |  | 140 | 192
Current |  | 3,721 | 5,251
Acquired Impaired | [1] | 0 | 0
Total Loans |  | 3,861 | 5,443
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Acquired Loans [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Past Due |  | 126 | 174
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Acquired Loans [Member] | 90+ Days Past Due [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + Days Past Due and Still Accruing |  | 0 | 0
Consumer Portfolio Segment [Member] | Home Equity [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Loans |  | 345,446 | 342,342
Consumer Portfolio Segment [Member] | Home Equity [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Nonaccrual |  | 1,993 | 2,172
Total Past Due |  | 3,307 | 4,169
Current |  | 289,015 | 278,904
Total Loans |  | 292,322 | 283,073
Consumer Portfolio Segment [Member] | Home Equity [Member] | Legacy Loans [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Past Due |  | 1,023 | 1,802
Consumer Portfolio Segment [Member] | Home Equity [Member] | Legacy Loans [Member] | 90+ Days Past Due [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + Days Past Due and Still Accruing |  | 291 | 195
Consumer Portfolio Segment [Member] | Home Equity [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Nonaccrual |  | 432 | 426
Total Past Due |  | 947 | 1,146
Current |  | 52,177 | 58,123
Acquired Impaired | [1] | 0 | 0
Total Loans |  | 53,124 | 59,269
Consumer Portfolio Segment [Member] | Home Equity [Member] | Acquired Loans [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total Past Due |  | 446 | 674
Consumer Portfolio Segment [Member] | Home Equity [Member] | Acquired Loans [Member] | 90+ Days Past Due [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + Days Past Due and Still Accruing |  | $ 69 | $ 46
[1] | Acquired impaired loans were not classified as nonperforming assets as the loans are considered to be performing under ASC 310-30. As a result interest income, through the accretion of the difference between the carrying amount of the loans and the expected cashflows, is being recognized on all acquired impaired loans.

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- Definition Loans acquired after January 1, 2009 that have evidence of deterioration in credit quality since origination and for which it is probable, at acquisition, that the company will be unable to collect all contractually required payments. + References No definition available. + Details
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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5111-111524 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5111-111524 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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