FAIR VALUE - Schedule of Carrying Amounts and Estimated Fair Value of Assets And Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financial assets:
Marketable securities held to maturity		$ 160,460
Reported Value Measurement
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	$ 193,371	90,714
Marketable securities held to maturity		155,458
Loans, net	1,921,234	1,690,794
Accrued interest receivable	8,361	9,151
Nonmarketable equity securities	13,493	12,301
Financial liabilities:
Deposits	2,223,082	1,956,804
Securities sold under repurchase agreements	20,520	11,100
Accrued interest payable	945	1,642
Federal Home Loan Bank advances	99,105	55,118
Subordinated debentures	20,310	10,810
Fair Value
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	193,371	90,714
Marketable securities held to maturity		160,460
Loans, net	1,932,813	1,705,155
Accrued interest receivable	8,361	9,151
Nonmarketable equity securities	13,493	12,301
Financial liabilities:
Deposits	2,225,284	1,958,978
Securities sold under repurchase agreements	20,520	11,100
Accrued interest payable	945	1,642
Federal Home Loan Bank advances	99,144	55,125
Subordinated debentures	17,891	8,677
Fair Value | Level 1 Inputs
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	193,371	90,714
Marketable securities held to maturity		0
Loans, net	0	0
Accrued interest receivable	0	0
Nonmarketable equity securities	0	0
Financial liabilities:
Deposits	1,834,047	1,438,509
Securities sold under repurchase agreements	0	0
Accrued interest payable	0	0
Federal Home Loan Bank advances	0	0
Subordinated debentures	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		160,460
Loans, net	0	0
Accrued interest receivable	8,361	9,151
Nonmarketable equity securities	13,493	12,301
Financial liabilities:
Deposits	391,237	520,469
Securities sold under repurchase agreements	20,520	11,100
Accrued interest payable	945	1,642
Federal Home Loan Bank advances	99,144	55,125
Subordinated debentures	17,891	8,677
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	1,932,813	1,705,155
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 debentures	$ 0	$ 0