DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of financial instruments fair value (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Subordinated debentures
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 25,774	$ 25,774
Fair Value	$ 25,774	$ 25,774
Hierarchy Level	3	3
Subordinated notes
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 74,653	$ 74,579
Fair Value	$ 72,188	$ 71,625
Hierarchy Level	2	2
Deposits
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 4,773,397	$ 4,721,708
Fair Value	$ 4,766,200	$ 4,714,624
Hierarchy Level	3	3
Short-term Debt
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 254,125	$ 323,453
Fair Value	$ 254,125	$ 323,453
Hierarchy Level	3	3
Unrecognized financial instruments (net of contractual value) | Commitments to originate loans
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Hierarchy Level	3	3
Unrecognized financial instruments (net of contractual value) | Letters of credit
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 59	$ 78
Fair Value	$ 59	$ 78
Hierarchy Level	3	3
Unrecognized financial instruments (net of contractual value) | Lines of credit
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Hierarchy Level	3	3
Interest payable
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 8,135	$ 6,225
Fair Value	$ 8,135	$ 6,225
Hierarchy Level	3	3
Loans, net of allowance for credit losses
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 4,586,253	$ 4,589,620
Fair Value	$ 4,399,795	$ 4,402,314
Hierarchy Level	3	3
Cash and cash equivalents
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 171,447	$ 211,333
Fair Value	$ 171,447	$ 211,333
Hierarchy Level	1	1
Held-to-maturity securities
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 193,366	$ 195,023
Fair Value	$ 167,756	$ 171,193
Hierarchy Level	2	2
Mortgage loans held for sale
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 10,905	$ 5,849
Fair Value	$ 10,905	$ 5,849
Hierarchy Level	2	2
Interest Receivable
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 21,639	$ 21,206
Fair Value	$ 21,639	$ 21,206
Hierarchy Level	3	3
Investment in FHLB stock and other assets
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 16,887	$ 26,313
Fair Value	$ 16,887	$ 26,313
Hierarchy Level	3	3