FAIR VALUE - Schedule of Carrying Amounts and Estimated Fair Value of Assets And Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Reported Value Measurement
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	$ 408,875	$ 351,792
Marketable securities held to maturity	173,676
Loans, net	1,938,268	1,831,737
Accrued interest receivable	7,673	9,834
Nonmarketable equity securities	14,061	14,095
Financial liabilities:
Deposits	2,563,071	2,286,390
Securities sold under repurchase agreements	11,195	15,631
Accrued interest payable	555	804
Federal Home Loan Bank advances	47,500	109,101
Subordinated debentures	19,810	19,810
Fair Value
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	408,875	351,792
Marketable securities held to maturity	182,631
Loans, net	1,949,191	1,846,868
Accrued interest receivable	7,673	9,834
Nonmarketable equity securities	14,061	14,095
Financial liabilities:
Deposits	2,563,869	2,288,157
Securities sold under repurchase agreements	11,195	15,631
Accrued interest payable	555	804
Federal Home Loan Bank advances	47,653	109,381
Subordinated debentures	17,813	17,406
Fair Value | Level 1 Inputs
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	408,875	351,792
Marketable securities held to maturity	0
Loans, net	0	0
Accrued interest receivable	0	0
Nonmarketable equity securities		0
Financial liabilities:
Deposits	2,221,716	1,907,587
Securities sold under repurchase agreements	0	0
Accrued interest payable	0	0
Federal Home Loan Bank advances	0	0
Subordinated debentures		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	182,631
Loans, net	0	0
Accrued interest receivable	7,673	9,834
Nonmarketable equity securities	14,061	14,095
Financial liabilities:
Deposits	342,153	380,570
Securities sold under repurchase agreements	11,195	15,631
Accrued interest payable	555	804
Federal Home Loan Bank advances	47,653	109,381
Subordinated debentures	17,813	17,406
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
Loans, net	1,949,191	1,846,868
Accrued interest receivable	0	0
Nonmarketable equity securities		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 debentures		$ 0