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FAIR VALUE - Schedule of Carrying Amounts and Estimated Fair Value of Assets And Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financial assets:
Marketable securities held to maturity	$ 162,596	$ 176,790
Carrying Amount
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	54,051	91,428
Marketable securities held to maturity	164,839	174,684
Loans, net	1,638,149	1,347,779
Accrued interest receivable	7,760	8,174
Nonmarketable equity securities	13,818	9,453
Cash surrender value of life insurance	25,747	19,117
Financial liabilities:
Deposits	1,837,339	1,676,320
Securities sold under repurchase agreements	11,107	12,879
Accrued interest payable	1,464	922
Federal Home Loan Bank advances	129,140	45,153
Subordinated debentures	12,810	13,810
Fair Value
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	54,051	91,428
Marketable securities held to maturity	162,596	176,790
Loans, net	1,622,802	1,346,361
Accrued interest receivable	7,760	8,174
Nonmarketable equity securities	13,818	9,453
Cash surrender value of life insurance	25,747	19,117
Financial liabilities:
Deposits	1,836,166	1,676,445
Securities sold under repurchase agreements	11,107	12,879
Accrued interest payable	1,464	922
Federal Home Loan Bank advances	128,853	44,722
Subordinated debentures	10,662	11,495
Fair Value | Level 1 Inputs
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	54,051	91,428
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	1,443,080	1,378,467
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	162,596	176,790
Loans, net	0	0
Accrued interest receivable	7,760	8,174
Nonmarketable equity securities	13,818	9,453
Cash surrender value of life insurance	25,747	19,117
Financial liabilities:
Deposits	393,086	297,978
Securities sold under repurchase agreements	11,107	12,879
Accrued interest payable	1,464	922
Federal Home Loan Bank advances	128,853	44,722
Subordinated debentures	10,662	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	1,622,802	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
Federal Home Loan Bank advances	0	0
Subordinated debentures	$ 0	$ 0

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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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