FAIR VALUE DISCLOSURES - Fair market values of all financial instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financial Assets:
Accrued interest receivable	$ 7,800	$ 7,500
Equity investments	16,807	16,710
Financial Liabilities:
Noninterest-bearing deposits	1,195,541	1,184,861
Interest-bearing deposits	1,596,692	1,667,527
Federal Home Loan Bank advances	50,000	50,000
Repurchase agreements	1,415	485
Fair Value
Financial Assets:
Total financial assets	2,993,946	3,123,948
Financial Liabilities:
Total financial liabilities	2,862,426	2,886,532
Carrying Amount
Financial Assets:
Total financial assets	3,024,082	3,084,854
Financial Liabilities:
Total financial liabilities	2,844,697	2,903,878
Level 1 Inputs | Fair Value
Financial Assets:
Cash and due from banks	284,898	372,064
Financial Liabilities:
Noninterest-bearing deposits	1,214,222	1,184,861
Level 1 Inputs | Carrying Amount
Financial Assets:
Cash and due from banks	284,898	372,064
Financial Liabilities:
Noninterest-bearing deposits	1,195,541	1,184,861
Level 2 Inputs | Fair Value
Financial Assets:
Bank-owned life insurance	72,297	71,881
Accrued interest receivable	8,653	8,742
Servicing asset	152	189
Financial Liabilities:
Interest-bearing deposits	1,595,014	1,651,359
Federal Home Loan Bank advances	50,727	48,822
Repurchase agreements	1,414	485
Accrued interest payable	1,049	1,005
Level 2 Inputs | Carrying Amount
Financial Assets:
Bank-owned life insurance	72,297	71,881
Accrued interest receivable	8,653	8,742
Servicing asset	152	189
Financial Liabilities:
Interest-bearing deposits	1,596,692	1,667,527
Federal Home Loan Bank advances	50,000	50,000
Repurchase agreements	1,415	485
Accrued interest payable	1,049	1,005
Level 3 Inputs | Fair Value
Financial Assets:
Loans, including held for sale, net	2,611,139	2,654,362
Equity investments	16,807	16,710
Level 3 Inputs | Carrying Amount
Financial Assets:
Loans, including held for sale, net	2,641,275	2,615,268
Equity investments	$ 16,807	$ 16,710