FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying amount and estimated fair value (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financial assets:
Debt securities held-to-maturity	$ 478,801	$ 336,027
Level 1 | Carrying Amount
Financial assets:
Cash and cash equivalents	114,159	409,268
Level 1 | Estimated Fair Value
Financial assets:
Cash and cash equivalents	114,159	409,268
Level 2 | Carrying Amount
Financial assets:
Debt securities held-to-maturity	541,600	336,185
Accrued interest receivable	19,506	14,901
Financial liabilities:
Securities sold under agreements to repurchase	43,081	61,256
Accrued interest payable	1,363	1,043
Level 2 | Estimated Fair Value
Financial assets:
Debt securities held-to-maturity	478,801	336,027
Accrued interest receivable	19,506	14,901
Financial liabilities:
Securities sold under agreements to repurchase	43,081	61,256
Accrued interest payable	1,363	1,043
Level 3 | Carrying Amount
Financial assets:
Restricted stock	7,965	2,739
Loans, net	2,594,920	2,475,753
Investments in unconsolidated subsidiaries	1,165	1,165
Financial liabilities:
Time deposits	262,968	328,208
Level 3 | Estimated Fair Value
Financial assets:
Restricted stock	7,965	2,739
Loans, net	2,566,930	2,494,686
Investments in unconsolidated subsidiaries	1,165	1,165
Financial liabilities:
Time deposits	253,619	327,779
Subordinated Notes | Level 3 | Carrying Amount
Financial liabilities:
Subordinated debt	39,395	39,316
Subordinated Notes | Level 3 | Estimated Fair Value
Financial liabilities:
Subordinated debt	37,205	41,602
Junior Subordinated Debentures Issued | Level 3 | Carrying Amount
Financial liabilities:
Subordinated debt	37,780	37,714
Junior Subordinated Debentures Issued | Level 3 | Estimated Fair Value
Financial liabilities:
Subordinated debt	$ 37,030	$ 33,640