FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying amount and estimated fair value (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financial assets:
Debt securities held-to-maturity	$ 481,925	$ 478,801
Level 1 | Carrying Amount
Financial assets:
Cash and cash equivalents	177,112	114,159
Level 1 | Estimated Fair Value
Financial assets:
Cash and cash equivalents	177,112	114,159
Level 2 | Carrying Amount
Financial assets:
Debt securities held-to-maturity	536,429	541,600
Accrued interest receivable	20,301	19,506
Financial liabilities:
Securities sold under agreements to repurchase	34,919	43,081
Accrued interest payable	1,402	1,363
Level 2 | Estimated Fair Value
Financial assets:
Debt securities held-to-maturity	481,925	478,801
Accrued interest receivable	20,301	19,506
Financial liabilities:
Securities sold under agreements to repurchase	34,919	43,081
Accrued interest payable	1,402	1,363
Level 3 | Carrying Amount
Financial assets:
Restricted stock	4,991	7,965
Loans, net	3,156,764	2,594,920
Investments in unconsolidated subsidiaries	1,614	1,165
Financial liabilities:
Time deposits	420,372	262,968
Level 3 | Estimated Fair Value
Financial assets:
Restricted stock	4,991	7,965
Loans, net	3,105,661	2,566,930
Investments in unconsolidated subsidiaries	1,614	1,165
Financial liabilities:
Time deposits	409,454	253,619
Subordinated Notes | Level 3 | Carrying Amount
Financial liabilities:
Subordinated debt	39,415	39,395
Subordinated Notes | Level 3 | Estimated Fair Value
Financial liabilities:
Subordinated debt	36,863	37,205
Junior Subordinated Debentures Issued | Level 3 | Carrying Amount
Financial liabilities:
Subordinated debt	52,746	37,780
Junior Subordinated Debentures Issued | Level 3 | Estimated Fair Value
Financial liabilities:
Subordinated debt	$ 50,720	$ 37,030