FAIR VALUE - Summary of carrying amounts and estimated fair values for financial instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025	Dec. 31, 2024
Assets:
Cash and cash equivalents	$ 174,886	$ 200,281	$ 232,314	$ 236,041
Held-to-maturity debt securities, net of ACL	112,617	90,635
Loans (includes $1,758 and $3,182 measured at fair value, respectively)	2,713,688	2,649,484
Accrued interest receivable	11,338	11,209
Liabilities:
FHLB borrowings – fixed rate	36,431	62,841
Subordinated notes	44,849	44,772
Accrued interest payable	1,243	1,295
Fair Value Carrying Amount	26,433	43,358
Loans held for investment
Liabilities:
Fair Value Carrying Amount	1,758	3,182
Carrying Amount
Assets:
Cash and cash equivalents	174,886	200,281
Held-to-maturity debt securities, net of ACL	116,766	94,970
Loans (includes $1,758 and $3,182 measured at fair value, respectively)	2,689,748	2,625,800
Accrued interest receivable	11,338	11,209
Liabilities:
Term deposits	353,373	352,473
Non-term deposits	2,492,591	2,394,102
FHLB borrowings – fixed rate	36,431	12,332
FHLB borrowings – floating rate		50,000
Federal Reserve borrowings – fixed rate		509
Accrued interest payable	1,243	1,295
Subordinated Notes | Carrying Amount
Liabilities:
Subordinated notes	44,849	44,772
Quoted Prices in Active Markets for Identical Assets (Level 1) | Estimate of Fair Value Measurement
Assets:
Cash and cash equivalents	174,886	200,281
Held-to-maturity debt securities, net of ACL	247	248
Accrued interest receivable	11,338	11,209
Liabilities:
Term deposits	328,719	327,898
Non-term deposits	2,492,591	2,394,102
FHLB borrowings – fixed rate	36,431	12,332
Federal Reserve borrowings – fixed rate		509
Accrued interest payable	1,243	1,295
Significant Other Observable Inputs (Level 2) | Estimate of Fair Value Measurement
Assets:
Held-to-maturity debt securities, net of ACL	92,380	79,664
Liabilities:
FHLB borrowings – floating rate		50,000
Significant Unobservable Inputs (Level 3) | Estimate of Fair Value Measurement
Assets:
Held-to-maturity debt securities, net of ACL	19,990	10,723
Loans (includes $1,758 and $3,182 measured at fair value, respectively)	2,635,054	2,567,911
Liabilities:
Term deposits	24,574	24,825
Significant Unobservable Inputs (Level 3) | Subordinated Notes | Estimate of Fair Value Measurement
Liabilities:
Subordinated notes	$ 41,234	$ 42,017