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LOANS, Loan Summary (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Loans receivable, net [Abstract] |  |  |  |  |  |
Gross loans, including deferred origination costs | $ 7,528,039 |  | $ 6,890,543 |  |  |
Allowance for credit losses | (64,437) | $ (55,652) | (49,911) | $ (49,310) | $ (49,107) | $ (49,284)
Net loans | 7,463,602 |  | 6,840,632 |  |  |
Business Lending [Member] |  |  |  |  |  |
Loans receivable, net [Abstract] |  |  |  |  |  |
Gross loans, including deferred origination costs |  |  | 2,775,876 |  |  |
Commercial Portfolio Segment [Member] | Business Lending [Member] |  |  |  |  |  |
Loans receivable, net [Abstract] |  |  |  |  |  |
Gross loans, including deferred origination costs | 3,455,343 |  | 2,775,876 |  |  |
Allowance for credit losses | (24,204) | (19,489) | (19,426) | (17,769) | (18,271) | (18,522)
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] |  |  |  |  |  |
Loans receivable, net [Abstract] |  |  |  |  |  |
Gross loans, including deferred origination costs | 2,428,060 |  | 2,430,902 |  |  |
Allowance for credit losses | (13,088) | (12,430) | (10,269) | (10,763) | (10,317) | (10,124)
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] |  |  |  |  |  |
Loans receivable, net [Abstract] |  |  |  |  |  |
Gross loans, including deferred origination costs | 1,056,865 |  | 1,113,062 |  |  |
Allowance for credit losses | (15,866) | (13,694) | (13,712) | (14,345) | (14,251) | (14,366)
Consumer Portfolio Segment [Member] | Consumer Direct [Member] |  |  |  |  |  |
Loans receivable, net [Abstract] |  |  |  |  |  |
Gross loans, including deferred origination costs | 169,228 |  | 184,378 |  |  |
Allowance for credit losses | (4,028) | (3,737) | (3,255) | (3,184) | (3,056) | (3,095)
Consumer Portfolio Segment [Member] | Home Equity [Member] |  |  |  |  |  |
Loans receivable, net [Abstract] |  |  |  |  |  |
Gross loans, including deferred origination costs | 418,543 |  | 386,325 |  |  |
Allowance for credit losses | $ (2,690) | $ (2,484) | $ (2,129) | $ (2,103) | $ (2,067) | $ (2,144)

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