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LOANS, Credit Quality By Past Due Status (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | $ 4,948,562 | $ 4,801,375
Legacy Loan [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 1,963 | 1,801
Nonaccrual |  | 16,600 | 18,805
Total past due |  | 50,545 | 49,612
Current |  | 4,402,657 | 4,134,109
Total loans |  | 4,453,202 | 4,183,721
Legacy Loan [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total past due |  | 31,982 | 29,006
Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 1,113 | 394
Nonaccrual |  | 4,019 | 2,923
Total past due |  | 8,439 | 6,246
Acquired impaired | [1] | 5,553 | 7,299
Current |  | 481,368 | 604,109
Total loans |  | 495,360 | 617,654
Acquired Loans [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total past due |  | 3,307 | 2,929
Consumer Mortgage [Member] | Legacy Loan [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 1,659,760 | 1,581,458
Consumer Mortgage [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 159,941 | 188,296
Business Lending [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 1,490,076 | 1,497,271
Business Lending [Member] | Legacy Loan [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 1,277,666 | 1,233,628
Business Lending [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 212,410 | 263,643
Consumer Indirect [Member] | Legacy Loan [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 1,014,825 | 890,339
Consumer Indirect [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 30,147 | 45,421
Consumer Direct [Member] | Legacy Loan [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 181,922 | 178,051
Consumer Direct [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 9,893 | 17,025
Home Equity [Member] | Legacy Loan [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 319,029 | 300,245
Home Equity [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 82,969 | 103,269
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 1,819,701 | 1,769,754
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Legacy Loan [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 1,180 | 1,411
Nonaccrual |  | 11,352 | 11,394
Total past due |  | 23,911 | 23,287
Current |  | 1,635,849 | 1,558,171
Total loans |  | 1,659,760 | 1,581,458
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Legacy Loan [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total past due |  | 11,379 | 10,482
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 205 | 394
Nonaccrual |  | 2,332 | 1,396
Total past due |  | 4,076 | 3,163
Acquired impaired | [1] | 0 | 0
Current |  | 155,865 | 185,133
Total loans |  | 159,941 | 188,296
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 |  | 1,539 | 1,373
Commercial Portfolio Segment [Member] | Business Lending [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 1,490,076 | 1,497,271
Commercial Portfolio Segment [Member] | Business Lending [Member] | Legacy Loan [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 145 | 126
Nonaccrual |  | 3,811 | 5,381
Total past due |  | 7,877 | 9,949
Current |  | 1,269,789 | 1,223,679
Total loans |  | 1,277,666 | 1,233,628
Commercial Portfolio Segment [Member] | Business Lending [Member] | Legacy Loan [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total past due |  | 3,921 | 4,442
Commercial Portfolio Segment [Member] | Business Lending [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 0 | 0
Nonaccrual |  | 1,252 | 1,186
Total past due |  | 1,780 | 1,721
Acquired impaired | [1] | 5,553 | 7,299
Current |  | 205,077 | 254,623
Total loans |  | 212,410 | 263,643
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 |  | 528 | 535
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 1,044,972 | 935,760
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Legacy Loan [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 166 | 102
Nonaccrual |  | 0 | 0
Total past due |  | 14,049 | 11,677
Current |  | 1,000,776 | 878,662
Total loans |  | 1,014,825 | 890,339
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Legacy Loan [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total past due |  | 13,883 | 11,575
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 3 | 0
Nonaccrual |  | 0 | 0
Total past due |  | 234 | 245
Acquired impaired | [1] | 0 | 0
Current |  | 29,913 | 45,176
Total loans |  | 30,147 | 45,421
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 |  | 231 | 245
Consumer Portfolio Segment [Member] | Consumer Direct [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 191,815 | 195,076
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Legacy Loan [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 58 | 51
Nonaccrual |  | 0 | 1
Total past due |  | 1,607 | 1,466
Current |  | 180,315 | 176,585
Total loans |  | 181,922 | 178,051
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Legacy Loan [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total past due |  | 1,549 | 1,414
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 0 | 0
Nonaccrual |  | 0 | 14
Total past due |  | 231 | 154
Acquired impaired | [1] | 0 | 0
Current |  | 9,662 | 16,871
Total loans |  | 9,893 | 17,025
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 |  | 231 | 140
Consumer Portfolio Segment [Member] | Home Equity [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 401,998 | 403,514
Consumer Portfolio Segment [Member] | Home Equity [Member] | Legacy Loan [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 414 | 111
Nonaccrual |  | 1,437 | 2,029
Total past due |  | 3,101 | 3,233
Current |  | 315,928 | 297,012
Total loans |  | 319,029 | 300,245
Consumer Portfolio Segment [Member] | Home Equity [Member] | Legacy Loan [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total past due |  | 1,250 | 1,093
Consumer Portfolio Segment [Member] | Home Equity [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 905 | 0
Nonaccrual |  | 435 | 327
Total past due |  | 2,118 | 963
Acquired impaired | [1] | 0 | 0
Current |  | 80,851 | 102,306
Total loans |  | 82,969 | 103,269
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 |  | $ 778 | $ 636
[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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