FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying amount and estimated fair value (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financial assets:
Debt securities held-to-maturity	$ 469,921	$ 478,801
Level 1 | Carrying Amount
Financial assets:
Cash and cash equivalents	109,808	114,159
Level 1 | Estimated Fair Value
Financial assets:
Cash and cash equivalents	109,808	114,159
Level 2 | Carrying Amount
Financial assets:
Debt securities held-to-maturity	533,231	541,600
Accrued interest receivable	19,900	19,506
Financial liabilities:
Securities sold under agreements to repurchase	38,729	43,081
Accrued interest payable	2,386	1,363
Level 2 | Estimated Fair Value
Financial assets:
Debt securities held-to-maturity	469,921	478,801
Accrued interest receivable	19,900	19,506
Financial liabilities:
Securities sold under agreements to repurchase	38,729	43,081
Accrued interest payable	2,386	1,363
Level 3 | Carrying Amount
Financial assets:
Restricted stock	11,345	7,965
Loans, net	3,206,841	2,594,920
Investments in unconsolidated subsidiaries	1,614	1,165
Financial liabilities:
Time deposits	469,355	262,968
Level 3 | Estimated Fair Value
Financial assets:
Restricted stock	11,345	7,965
Loans, net	3,143,481	2,566,930
Investments in unconsolidated subsidiaries	1,614	1,165
Financial liabilities:
Time deposits	457,327	253,619
Subordinated Notes | Level 3 | Carrying Amount
Financial liabilities:
Subordinated debt	39,435	39,395
Subordinated Notes | Level 3 | Estimated Fair Value
Financial liabilities:
Subordinated debt	32,481	37,205
Junior Subordinated Debentures Issued | Level 3 | Carrying Amount
Financial liabilities:
Subordinated debt	52,760	37,780
Junior Subordinated Debentures Issued | Level 3 | Estimated Fair Value
Financial liabilities:
Subordinated debt	$ 41,993	$ 37,030