FAIR VALUE DISCLOSURES - Fair market values of all financial instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financial Assets:
Accrued interest receivable	$ 9,000	$ 9,600
Financial Liabilities:
Noninterest-bearing deposits	1,780,473	1,784,981
Interest-bearing deposits	1,943,301	2,046,303
Federal Home Loan Bank advances		50,000
Fair Value
Financial Assets:
Total financial assets	3,379,770	3,917,660
Financial Liabilities:
Total financial liabilities	3,718,802	3,876,567
Carrying Amount
Financial Assets:
Total financial assets	3,567,506	3,889,340
Financial Liabilities:
Total financial liabilities	3,724,080	3,881,485
Level 1 Inputs | Fair Value
Financial Assets:
Cash and due from banks	370,448	950,146
Financial Liabilities:
Noninterest-bearing deposits	1,780,473	1,784,981
Level 1 Inputs | Carrying Amount
Financial Assets:
Cash and due from banks	370,448	950,146
Financial Liabilities:
Noninterest-bearing deposits	1,780,473	1,784,981
Level 2 Inputs | Fair Value
Financial Assets:
Bank-owned life insurance	74,274	73,156
Accrued interest receivable	10,777	11,616
Servicing asset	328	352
Financial Liabilities:
Interest-bearing deposits	1,938,023	2,040,794
Federal Home Loan Bank advances		50,591
Accrued interest payable	306	201
Level 2 Inputs | Carrying Amount
Financial Assets:
Bank-owned life insurance	74,274	73,156
Accrued interest receivable	10,777	11,616
Servicing asset	328	352
Financial Liabilities:
Interest-bearing deposits	1,943,301	2,046,303
Federal Home Loan Bank advances		50,000
Accrued interest payable	306	201
Level 3 Inputs | Fair Value
Financial Assets:
Loans, including held for sale, net	2,906,108	2,864,663
Other investments	17,835	17,727
Level 3 Inputs | Carrying Amount
Financial Assets:
Loans, including held for sale, net	3,093,844	2,836,343
Other investments	$ 17,835	$ 17,727