DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of financial instruments fair value (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
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	$ 74,950	$ 74,876
Fair Value	$ 74,813	$ 74,438
Hierarchy Level	2	2
Deposits
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 4,758,046	$ 4,605,549
Fair Value	$ 4,755,258	$ 4,602,312
Hierarchy Level	3	3
Short-term Debt
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 435,229	$ 578,691
Fair Value	$ 435,229	$ 578,691
Hierarchy Level	3	3
Interest payable
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 5,416	$ 12,761
Fair Value	$ 5,416	$ 12,761
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	$ 78	$ 72
Fair Value	$ 78	$ 72
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
Loans, net of allowance for credit losses
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 4,690,636	$ 4,690,393
Fair Value	$ 4,546,532	$ 4,529,729
Hierarchy Level	3	3
Cash and cash equivalents
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 217,181	$ 195,756
Fair Value	$ 217,181	$ 195,756
Hierarchy Level	1	1
Held-to-maturity securities
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 185,853	$ 187,433
Fair Value	$ 165,214	$ 162,765
Hierarchy Level	2	2
Mortgage loans held for sale
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 6,857	$ 6,937
Fair Value	$ 6,857	$ 6,937
Hierarchy Level	2	2
Interest receivable
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 21,504	$ 20,430
Fair Value	$ 21,504	$ 20,430
Hierarchy Level	3	3
Investment in FHLBank stock and other assets
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 25,813	$ 28,392
Fair Value	$ 25,813	$ 28,392
Hierarchy Level	3	3