FAIR VALUE - Summary of carrying amounts and estimated fair values for financial instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Assets:
Cash and cash equivalents	$ 264,051	$ 200,281	$ 271,582	$ 236,041
Held-to-maturity debt securities, net of ACL	90,775	90,635
Loans (includes $2,468 and $3,182 measured at fair value, respectively)	2,690,535	2,649,484
Accrued interest receivable	11,582	11,209
Liabilities:
FHLB borrowings – fixed rate	50,006	62,841
Subordinated notes	44,810	44,772
Accrued interest payable	1,593	1,295
Fair Value Carrying Amount	30,894	43,358
FHLB Advance
Liabilities:
FHLB borrowings – floating rate	50,000
Loans held for investment
Liabilities:
Fair Value Carrying Amount	2,468	3,182
Carrying Amount
Assets:
Cash and cash equivalents	264,051	200,281
Held-to-maturity debt securities, net of ACL	95,030	94,970
Loans (includes $2,468 and $3,182 measured at fair value, respectively)	2,666,846	2,625,800
Accrued interest receivable	11,582	11,209
Liabilities:
Term deposits	371,889	352,473
Non-term deposits	2,469,726	2,394,102
FHLB borrowings – fixed rate		12,332
FHLB borrowings – floating rate		50,000
Federal Reserve borrowings – fixed rate	6	509
Accrued interest payable	1,593	1,295
Subordinated Notes | Carrying Amount
Liabilities:
Subordinated notes	44,810	44,772
Quoted Prices in Active Markets for Identical Assets (Level 1) | Estimate of Fair Value Measurement
Assets:
Cash and cash equivalents	264,051	200,281
Held-to-maturity debt securities, net of ACL	247	248
Accrued interest receivable	11,582	11,209
Liabilities:
Term deposits	339,746	327,898
Non-term deposits	2,469,726	2,394,102
FHLB borrowings – fixed rate		12,332
Federal Reserve borrowings – fixed rate	6	509
Accrued interest payable	1,593	1,295
Significant Other Observable Inputs (Level 2) | Estimate of Fair Value Measurement
Assets:
Held-to-maturity debt securities, net of ACL	77,320	79,664
Liabilities:
FHLB borrowings – floating rate	50,000	50,000
Significant Unobservable Inputs (Level 3) | Estimate of Fair Value Measurement
Assets:
Held-to-maturity debt securities, net of ACL	13,208	10,723
Loans (includes $2,468 and $3,182 measured at fair value, respectively)	2,610,936	2,567,911
Liabilities:
Term deposits	32,171	24,825
Significant Unobservable Inputs (Level 3) | Subordinated Notes | Estimate of Fair Value Measurement
Liabilities:
Subordinated notes	$ 41,556	$ 42,017