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FAIR VALUE - Schedule of Carrying Amounts and Estimated Fair Value of Assets And Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financial assets:
Marketable securities held to maturity	$ 162,800	$ 176,790
Carrying Amount
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	71,510	91,428
Marketable securities held to maturity	163,164	174,684
Loans, net	1,645,444	1,347,779
Accrued interest receivable	9,292	8,174
Nonmarketable equity securities	14,937	9,453
Cash surrender value of life insurance	26,301	19,117
Financial liabilities:
Deposits	1,871,480	1,676,320
Securities sold under repurchase agreements	12,228	12,879
Accrued interest payable	1,651	922
Other debt	0	0
Federal Home Loan Bank advances	115,136	45,153
Subordinated debentures	12,810	13,810
Fair Value
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	71,510	91,428
Marketable securities held to maturity	162,800	176,790
Loans, net	1,630,600	1,346,361
Accrued interest receivable	9,292	8,174
Nonmarketable equity securities	14,937	9,453
Cash surrender value of life insurance	26,301	19,117
Financial liabilities:
Deposits	1,870,632	1,676,445
Securities sold under repurchase agreements	12,228	12,879
Accrued interest payable	1,651	922
Other debt	0	0
Federal Home Loan Bank advances	114,934	44,722
Subordinated debentures	10,724	11,495
Fair Value | Level 1 Inputs
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	71,510	66,657
Marketable securities held to maturity	0	0
Loans, net	0	0
Accrued interest receivable	0	0
Nonmarketable equity securities	0	0
Cash surrender value of life insurance	0	0
Financial liabilities:
Deposits	1,435,985	1,378,467
Securities sold under repurchase agreements	0	0
Accrued interest payable	0	0
Other debt	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	24,771
Marketable securities held to maturity	162,800	176,790
Loans, net	0	0
Accrued interest receivable	9,292	8,174
Nonmarketable equity securities	14,937	9,453
Cash surrender value of life insurance	26,301	19,117
Financial liabilities:
Deposits	434,647	297,978
Securities sold under repurchase agreements	12,228	12,879
Accrued interest payable	1,651	922
Other debt	0	0
Federal Home Loan Bank advances	114,934	44,722
Subordinated debentures	10,724	11,495
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	0
Loans, net	1,630,600	1,346,361
Accrued interest receivable	0	0
Nonmarketable equity securities	0	0
Cash surrender value of life insurance	0	0
Financial liabilities:
Deposits	0	0
Securities sold under repurchase agreements	0	0
Accrued interest payable	0	0
Other debt	0	0
Federal Home Loan Bank advances	0	0
Subordinated debentures	$ 0	$ 0

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