FAIR VALUE OF FINANCIAL INSTRUMENTS- Carrying values and fair value (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets
Investment securities available for sale	$ 656,254	$ 649,433
Equity securities recorded at fair value	5,640	5,621
Loans held for sale	113,852	16,431
Accrued interest receivable	16,532	16,346
Liabilities
Trust preferred debentures	48,420	48,288
Accrued interest payable	7,078	6,400
Level 1
Assets
Cash and due from banks	445,097	392,694
Federal funds sold	4,299	1,811
Level 2
Assets
Nonmarketable equity securities	46,068	44,505
Accrued interest receivable	16,532	16,346
Liabilities
Deposits	4,661,375	4,548,327
Short-term borrowings	43,578	82,029
FHLB and other borrowings	631,450	506,832
Subordinated debt	160,344	182,189
Trust preferred debentures	42,391	53,811
Accrued interest payable	7,078	6,400
Level 3
Assets
Loans, net	4,387,244	4,385,768
Carrying value
Assets
Cash and due from banks	445,097	392,694
Federal funds sold	4,299	1,811
Nonmarketable equity securities	46,068	44,505
Loans, net	4,337,659	4,373,382
Accrued interest receivable	16,532	16,346
Liabilities
Deposits	4,650,640	4,544,254
Short-term borrowings	43,578	82,029
FHLB and other borrowings	593,089	493,311
Subordinated debt	169,505	176,653
Trust preferred debentures	48,420	48,288
Accrued interest payable	7,078	6,400
Fair value
Assets
Cash and due from banks	445,097	392,694
Federal funds sold	4,299	1,811
Nonmarketable equity securities	46,068	44,505
Loans, net	4,387,244	4,385,768
Accrued interest receivable	16,532	16,346
Liabilities
Deposits	4,661,375	4,548,327
Short-term borrowings	43,578	82,029
FHLB and other borrowings	631,450	506,832
Subordinated debt	160,344	182,189
Trust preferred debentures	42,391	53,811
Accrued interest payable	7,078	6,400
Corporate Securities
Assets
Investment securities available for sale	$ 138,822	$ 122,736