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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, 2023 USD ($)	Dec. 31, 2022 USD ($)
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	$ 74,504	$ 74,281
Fair Value	$ 70,500	$ 72,000
Hierarchy Level	2	2
Deposits
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 4,851,548	$ 4,684,910
Fair Value	$ 4,839,018	$ 4,672,913
Hierarchy Level	3	3
Short-term Debt
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 142,282	$ 266,426
Fair Value	$ 142,282	$ 266,426
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	$ 79	$ 73
Fair Value	$ 79	$ 73
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	$ 6,619	$ 3,010
Fair Value	$ 6,619	$ 3,010
Hierarchy Level	3	3
Loans, net of allowance for credit losses
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 4,564,567	$ 4,506,836
Fair Value	$ 4,388,425	$ 4,391,084
Hierarchy Level	3	3
Cash and cash equivalents
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 182,315	$ 168,520
Fair Value	$ 182,315	$ 168,520
Hierarchy Level	1	1
Held-to-maturity securities
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 196,716	$ 202,495
Fair Value	$ 166,090	$ 177,765
Hierarchy Level	2	2
Mortgage loans held for sale
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 5,678	$ 4,811
Fair Value	$ 5,678	$ 4,811
Hierarchy Level	2	2
Interest Receivable
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 19,366	$ 19,107
Fair Value	$ 19,366	$ 19,107
Hierarchy Level	3	3
Investment in FHLB stock and other assets
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
Carrying Amount	$ 36,038	$ 30,814
Fair Value	$ 36,038	$ 30,814
Hierarchy Level	3	3

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481961/940-320-45-2

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