FAIR VALUE - Summary of carrying amounts and estimated fair values for financial instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 171,606	$ 386,983	$ 289,089	$ 155,989
Loans, net	2,132,037	1,935,405
Accrued interest receivable	7,884	7,151
Liabilities
Deposits	2,169,998	2,205,703
FHLB borrowings - fixed rate	87,223	38,629
Subordinated notes	32,553	39,031
Accrued interest payable	304	355
Carrying Amount
Assets
Cash and cash equivalents	171,606	386,983
Held-to-maturity securities	87,029
Loans, net	2,132,037	1,935,405
Accrued interest receivable	7,884	7,151
Liabilities
Deposits	2,169,998	2,205,703
FHLB borrowings - fixed rate	80,000	15,000
Federal Reserve Borrowings - fixed rate	7,223	23,629
Accrued interest payable	304	355
Subordinated notes - fixed-to-floating rate | Carrying Amount
Liabilities
Subordinated notes	32,553	39,031
Level 1 | Estimated Fair Value
Assets
Cash and cash equivalents	171,606	386,983
Held-to-maturity securities	236
Accrued interest receivable	3	2
Liabilities
Deposits	2,022,624	2,035,212
Accrued interest payable	38	87
Level 2 | Estimated Fair Value
Assets
Held-to-maturity securities	75,699
Accrued interest receivable	333	203
Liabilities
FHLB borrowings - fixed rate	79,789	14,990
Federal Reserve Borrowings - fixed rate	7,223	23,629
Level 3 | Estimated Fair Value
Assets
Held-to-maturity securities	8,807
Loans, net	2,105,608	1,919,625
Accrued interest receivable	7,548	6,946
Liabilities
Deposits	148,933	172,240
Accrued interest payable	266	268
Level 3 | Subordinated notes - fixed-to-floating rate | Estimated Fair Value
Liabilities
Subordinated notes	$ 32,476	$ 40,325