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DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of financial instruments fair value (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 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		$ 74,876
Fair Value		$ 74,438
Hierarchy Level	2	2
Deposits
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 4,528,033	$ 4,605,549
Fair Value	$ 4,525,509	$ 4,602,312
Hierarchy Level	3	3
Short-term borrowings
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 468,581	$ 578,691
Fair Value	$ 468,581	$ 578,691
Hierarchy Level	3	3
Interest payable
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 3,909	$ 12,761
Fair Value	$ 3,909	$ 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	$ 53	$ 72
Fair Value	$ 53	$ 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	$ 4,467,683	$ 4,690,393
Fair Value	$ 4,348,382	$ 4,529,729
Hierarchy Level	3	3
Cash and cash equivalents
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 196,235	$ 195,756
Fair Value	$ 196,235	$ 195,756
Hierarchy Level	1	1
Held-to-maturity securities
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 181,315	$ 187,433
Fair Value	$ 163,589	$ 162,765
Hierarchy Level	2	2
Mortgage loans held for sale
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 5,593	$ 6,937
Fair Value	$ 5,593	$ 6,937
Hierarchy Level	2	2
Interest receivable
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 19,931	$ 20,430
Fair Value	$ 19,931	$ 20,430
Hierarchy Level	3	3
Investment in FHLBank stock and other assets
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 25,603	$ 28,392
Fair Value	$ 25,603	$ 28,392
Hierarchy Level	3	3

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