FAIR VALUE DISCLOSURES - Fair market values of all financial instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financial Assets:
Accrued interest receivable	$ 9,600	$ 12,100
Financial Liabilities:
Noninterest-bearing deposits	1,784,981	1,476,425
Interest-bearing deposits	2,046,303	1,825,369
Federal Home Loan Bank advances	50,000	50,000
Fair Value
Financial Assets:
Total financial assets	3,917,660	3,562,391
Financial Liabilities:
Total financial liabilities	3,876,567	3,423,107
Carrying Amount
Financial Assets:
Total financial assets	3,889,340	3,528,690
Financial Liabilities:
Total financial liabilities	3,881,485	3,352,192
Level 1 Inputs | Fair Value
Financial Assets:
Cash and due from banks	950,146	538,007
Financial Liabilities:
Noninterest-bearing deposits	1,784,981	1,476,425
Level 1 Inputs | Carrying Amount
Financial Assets:
Cash and due from banks	950,146	538,007
Financial Liabilities:
Noninterest-bearing deposits	1,784,981	1,476,425
Level 2 Inputs | Fair Value
Financial Assets:
Bank-owned life insurance	73,156	72,338
Accrued interest receivable	11,616	13,350
Servicing asset	352	190
Financial Liabilities:
Interest-bearing deposits	2,040,794	1,894,558
Federal Home Loan Bank advances	50,591	51,726
Accrued interest payable	201	398
Level 2 Inputs | Carrying Amount
Financial Assets:
Bank-owned life insurance	73,156	72,338
Accrued interest receivable	11,616	13,350
Servicing asset	352	190
Financial Liabilities:
Interest-bearing deposits	2,046,303	1,825,369
Federal Home Loan Bank advances	50,000	50,000
Accrued interest payable	201	398
Level 3 Inputs | Fair Value
Financial Assets:
Loans, including held for sale, net	2,864,663	2,919,854
Other investments	17,727	18,652
Level 3 Inputs | Carrying Amount
Financial Assets:
Loans, including held for sale, net	2,836,343	2,886,153
Other investments	$ 17,727	$ 18,652