FAIR VALUE - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financial assets:
Loans, net	$ 14,527
Level 3 Inputs
Financial assets:
Loans, net	14,527
Reported Value Measurement
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	130,177	$ 106,467
Marketable securities held to maturity	408,308	509,008
Loans, net	2,286,163	2,344,245
Accrued interest receivable	11,307	11,555
Nonmarketable equity securities	26,077	25,585
Financial liabilities:
Deposits	2,658,293	2,681,154
Securities sold under repurchase agreements	19,366	7,221
Accrued interest payable	5,045	2,348
Federal Home Loan Bank advances	175,000	290,000
Subordinated debt	47,752	49,153
Fair Value
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	130,177	106,467
Marketable securities held to maturity	367,691	475,068
Loans, net	2,149,124	2,217,606
Accrued interest receivable	11,307	11,555
Nonmarketable equity securities	26,077	25,585
Financial liabilities:
Deposits	2,657,835	2,678,596
Securities sold under repurchase agreements	19,366	7,221
Accrued interest payable	5,045	2,348
Federal Home Loan Bank advances	174,872	289,926
Subordinated debt	48,452	50,025
Fair Value | Level 1 Inputs
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	130,177	106,467
Marketable securities held to maturity	0	0
Loans, net	0	0
Accrued interest receivable	0	0
Nonmarketable equity securities	0	0
Financial liabilities:
Deposits	1,944,979	2,326,615
Securities sold under repurchase agreements	0	0
Accrued interest payable	0	0
Federal Home Loan Bank advances	0	0
Subordinated debt	0	0
Fair Value | Level 2 Inputs
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	0	0
Marketable securities held to maturity	367,691	475,068
Loans, net	0	0
Accrued interest receivable	11,307	11,555
Nonmarketable equity securities	26,077	25,585
Financial liabilities:
Deposits	712,856	351,981
Securities sold under repurchase agreements	19,366	7,221
Accrued interest payable	5,045	2,348
Federal Home Loan Bank advances	174,872	289,926
Subordinated debt	48,452	50,025
Fair Value | Level 3 Inputs
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	0	0
Marketable securities held to maturity	0	0
Loans, net	2,149,124	2,217,606
Accrued interest receivable	0	0
Nonmarketable equity securities	0	0
Financial liabilities:
Deposits	0	0
Securities sold under repurchase agreements	0	0
Accrued interest payable	0	0
Federal Home Loan Bank advances	0	0
Subordinated debt	$ 0	$ 0