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LOANS, Credit Quality By Past Due Status (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | $ 6,284,070 | $ 6,281,121
Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 2,863 | 2,106
Nonaccrual |  | 15,529 | 16,182
Total past due |  | 45,548 | 53,387
Current |  | 5,087,231 | 4,974,597
Total loans |  | 5,132,779 | 5,027,984
Legacy Loans [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total past due |  | 27,156 | 35,099
Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 184 | 349
Nonaccrual |  | 5,884 | 6,362
Total past due |  | 9,168 | 9,332
Acquired impaired | [1] | 3,647 | 5,446
Current |  | 1,138,476 | 1,238,359
Total loans |  | 1,151,291 | 1,253,137
Acquired Loans [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total past due |  | 3,100 | 2,621
Business Lending [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 2,395,684 | 2,396,977
Business Lending [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 1,678,604 | 1,618,827
Business Lending [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 717,080 | 778,150
Consumer Mortgage [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 1,897,647 | 1,848,450
Consumer Mortgage [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 358,135 | 386,958
Consumer Indirect [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 1,074,947 | 1,072,392
Consumer Indirect [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 7,887 | 10,815
Consumer Direct [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 175,876 | 175,774
Consumer Direct [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 2,275 | 3,046
Home Equity [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 305,705 | 312,541
Home Equity [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 65,914 | 74,168
Commercial Portfolio Segment [Member] | Business Lending [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 2,395,684 | 2,396,977
Commercial Portfolio Segment [Member] | Business Lending [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 491 | 179
Nonaccrual |  | 4,086 | 4,872
Total past due |  | 8,835 | 10,312
Current |  | 1,669,769 | 1,608,515
Total loans |  | 1,678,604 | 1,618,827
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 |  | 4,258 | 5,261
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 |  | 3,294 | 3,498
Total past due |  | 4,313 | 4,472
Acquired impaired | [1] | 3,647 | 5,446
Current |  | 709,120 | 768,232
Total loans |  | 717,080 | 778,150
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 |  | 1,019 | 974
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 2,255,782 | 2,235,408
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 2,082 | 1,393
Nonaccrual |  | 10,079 | 9,872
Total past due |  | 21,836 | 23,733
Current |  | 1,875,811 | 1,824,717
Total loans |  | 1,897,647 | 1,848,450
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 |  | 9,675 | 12,468
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 |  | 80 | 232
Nonaccrual |  | 2,072 | 2,390
Total past due |  | 3,434 | 3,463
Acquired impaired | [1] | 0 | 0
Current |  | 354,701 | 383,495
Total loans |  | 358,135 | 386,958
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 |  | 1,282 | 841
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 1,082,834 | 1,083,207
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 157 | 258
Nonaccrual |  | 0 | 0
Total past due |  | 11,130 | 14,867
Current |  | 1,063,817 | 1,057,525
Total loans |  | 1,074,947 | 1,072,392
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 |  | 10,973 | 14,609
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 |  | 32 | 34
Nonaccrual |  | 0 | 0
Total past due |  | 65 | 112
Acquired impaired | [1] | 0 | 0
Current |  | 7,822 | 10,703
Total loans |  | 7,887 | 10,815
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 |  | 33 | 78
Consumer Portfolio Segment [Member] | Consumer Direct [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 178,151 | 178,820
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 27 | 48
Nonaccrual |  | 0 | 0
Total past due |  | 1,144 | 1,826
Current |  | 174,732 | 173,948
Total loans |  | 175,876 | 175,774
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 |  | 1,117 | 1,778
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 |  | 4 | 4
Nonaccrual |  | 0 | 0
Total past due |  | 44 | 119
Acquired impaired | [1] | 0 | 0
Current |  | 2,231 | 2,927
Total loans |  | 2,275 | 3,046
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 |  | 40 | 115
Consumer Portfolio Segment [Member] | Home Equity [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  | 371,619 | 386,709
Consumer Portfolio Segment [Member] | Home Equity [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 106 | 228
Nonaccrual |  | 1,364 | 1,438
Total past due |  | 2,603 | 2,649
Current |  | 303,102 | 309,892
Total loans |  | 305,705 | 312,541
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 |  | 1,133 | 983
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 |  | 68 | 79
Nonaccrual |  | 518 | 474
Total past due |  | 1,312 | 1,166
Acquired impaired | [1] | 0 | 0
Current |  | 64,602 | 73,002
Total loans |  | 65,914 | 74,168
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 |  | $ 726 | $ 613
[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.

X
- 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 Amount of financing receivable 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922355-210448 + Details
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