FAIR VALUE DISCLOSURES - Fair market values of all financial instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financial Assets:
Accrued interest receivable	$ 12,000	$ 7,500
Equity investments	18,369	16,710
Financial Liabilities:
Noninterest-bearing deposits	1,513,748	1,184,861
Interest-bearing deposits	1,740,455	1,667,527
Federal Home Loan Bank advances	50,000	50,000
Repurchase agreements	2,500	485
Fair Value
Financial Assets:
Total financial assets	3,508,231	3,123,948
Financial Liabilities:
Total financial liabilities	3,370,599	2,886,532
Carrying Amount
Financial Assets:
Total financial assets	3,491,830	3,084,854
Financial Liabilities:
Total financial liabilities	3,307,513	2,903,878
Level 1 Inputs | Fair Value
Financial Assets:
Cash and due from banks	492,400	372,064
Financial Liabilities:
Noninterest-bearing deposits	1,513,748	1,184,861
Level 1 Inputs | Carrying Amount
Financial Assets:
Cash and due from banks	492,400	372,064
Financial Liabilities:
Noninterest-bearing deposits	1,513,748	1,184,861
Level 2 Inputs | Fair Value
Financial Assets:
Bank-owned life insurance	72,709	71,881
Accrued interest receivable	12,999	8,742
Servicing asset	143	189
Financial Liabilities:
Interest-bearing deposits	1,802,436	1,651,359
Federal Home Loan Bank advances	51,106	48,822
Repurchase agreements	2,499	485
Accrued interest payable	810	1,005
Level 2 Inputs | Carrying Amount
Financial Assets:
Bank-owned life insurance	72,709	71,881
Accrued interest receivable	12,999	8,742
Servicing asset	143	189
Financial Liabilities:
Interest-bearing deposits	1,740,455	1,667,527
Federal Home Loan Bank advances	50,000	50,000
Repurchase agreements	2,500	485
Accrued interest payable	810	1,005
Level 3 Inputs | Fair Value
Financial Assets:
Loans, including held for sale, net	2,911,611	2,654,362
Equity investments	18,369	16,710
Level 3 Inputs | Carrying Amount
Financial Assets:
Loans, including held for sale, net	2,895,210	2,615,268
Equity investments	$ 18,369	$ 16,710