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LOANS, Credit Quality By Past Due Status (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | $ 12,736 |
Nonaccrual |  | 19,046 |
Total past due |  | 76,044 |
Current |  | 6,780,267 |
Total loans |  | 6,866,092 | $ 6,890,543
Interest income on nonaccrual loans |  | 0 |
Purchased Credit Deteriorated ("PCD") [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans | [1] | 9,781 |
Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total past due |  | 44,262 |
Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  |  | 2,707
Nonaccrual |  |  | 15,415
Total past due |  |  | 48,684
Current |  |  | 5,401,908
Total loans |  |  | 5,450,592
Legacy Loans [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total past due |  |  | 30,562
Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  |  | 2,719
Nonaccrual |  |  | 3,420
Total past due |  |  | 16,429
Impaired | [2] |  | 11,797
Current |  |  | 1,411,725
Total loans |  |  | 1,439,951
Acquired Loans [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total past due |  |  | 10,290
Business Lending [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  |  | 2,775,876
Business Lending [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  |  | 1,856,585
Business Lending [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  |  | 919,291
Consumer Mortgage [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  |  | 1,996,716
Consumer Mortgage [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  |  | 434,186
Consumer Indirect [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  |  | 1,107,308
Consumer Indirect [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  |  | 5,754
Consumer Direct [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  |  | 175,976
Consumer Direct [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  |  | 8,402
Home Equity [Member] | Legacy Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  |  | 314,007
Home Equity [Member] | Acquired Loans [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans |  |  | 72,318
Commercial Portfolio Segment [Member] | Business Lending [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 10,111 |
Nonaccrual |  | 4,394 |
Total past due |  | 27,662 |
Current |  | 2,751,687 |
Total loans |  | 2,789,130 | 2,775,876
Commercial Portfolio Segment [Member] | Business Lending [Member] | Purchased Credit Deteriorated ("PCD") [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans | [1] | 9,781 |
Commercial Portfolio Segment [Member] | Business Lending [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total past due |  | 13,157 |
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 |  |  | 126
Nonaccrual |  |  | 3,840
Total past due |  |  | 7,902
Current |  |  | 1,848,683
Total loans |  |  | 1,856,585
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 |  |  | 3,936
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 |  |  | 2,173
Nonaccrual |  |  | 570
Total past due |  |  | 11,261
Impaired | [2] |  | 11,797
Current |  |  | 896,233
Total loans |  |  | 919,291
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 |  |  | 8,518
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 1,821 |
Nonaccrual |  | 12,674 |
Total past due |  | 30,109 |
Current |  | 2,394,547 |
Total loans |  | 2,424,656 | 2,430,902
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Purchased Credit Deteriorated ("PCD") [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans | [1] | 0 |
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total past due |  | 15,614 |
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 |  |  | 2,052
Nonaccrual |  |  | 10,131
Total past due |  |  | 23,173
Current |  |  | 1,973,543
Total loans |  |  | 1,996,716
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 |  |  | 10,990
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 |  |  | 277
Nonaccrual |  |  | 2,386
Total past due |  |  | 3,553
Impaired | [2] |  | 0
Current |  |  | 430,633
Total loans |  |  | 434,186
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 |  |  | 890
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 418 |
Nonaccrual |  | 0 |
Total past due |  | 11,761 |
Current |  | 1,076,118 |
Total loans |  | 1,087,879 | 1,113,062
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Purchased Credit Deteriorated ("PCD") [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans | [1] | 0 |
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total past due |  | 11,343 |
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 |  |  | 125
Nonaccrual |  |  | 0
Total past due |  |  | 12,798
Current |  |  | 1,094,510
Total loans |  |  | 1,107,308
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 |  |  | 12,673
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 |  |  | 31
Nonaccrual |  |  | 0
Total past due |  |  | 110
Impaired | [2] |  | 0
Current |  |  | 5,644
Total loans |  |  | 5,754
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 |  |  | 79
Consumer Portfolio Segment [Member] | Consumer Direct [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 62 |
Nonaccrual |  | 52 |
Total past due |  | 1,311 |
Current |  | 176,533 |
Total loans |  | 177,844 | 184,378
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Purchased Credit Deteriorated ("PCD") [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans | [1] | 0 |
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total past due |  | 1,197 |
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 |  |  | 76
Nonaccrual |  |  | 0
Total past due |  |  | 1,531
Current |  |  | 174,445
Total loans |  |  | 175,976
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 |  |  | 1,455
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
Nonaccrual |  |  | 52
Total past due |  |  | 111
Impaired | [2] |  | 0
Current |  |  | 8,291
Total loans |  |  | 8,402
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 |  |  | 59
Consumer Portfolio Segment [Member] | Home Equity [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
90 + days past due and still accruing |  | 324 |
Nonaccrual |  | 1,926 |
Total past due |  | 5,201 |
Current |  | 381,382 |
Total loans |  | 386,583 | 386,325
Consumer Portfolio Segment [Member] | Home Equity [Member] | Purchased Credit Deteriorated ("PCD") [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total loans | [1] | 0 |
Consumer Portfolio Segment [Member] | Home Equity [Member] | Past Due 30 - 89 Days [Member] |  |  |
Aged analysis of the company's loans [Abstract] |  |  |
Total past due |  | $ 2,951 |
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 |  |  | 328
Nonaccrual |  |  | 1,444
Total past due |  |  | 3,280
Current |  |  | 310,727
Total loans |  |  | 314,007
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 |  |  | 1,508
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 |  |  | 238
Nonaccrual |  |  | 412
Total past due |  |  | 1,394
Impaired | [2] |  | 0
Current |  |  | 70,924
Total loans |  |  | 72,318
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 |  |  | $ 744
[1] | PCD loans were not classified as nonperforming assets as the loans are considered to be performing under ASC 326-10. As a result, the noncredit discount, after the adjustment for the allowance for credit losses, is being accreted into interest income on all PCD loans.
[2] | 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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