FAIR VALUE - Schedule of Carrying Amounts and Estimated Fair Value of Assets And Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financial assets:
Marketable securities held to maturity	$ 162,165	$ 162,800
Reported Value Measurement
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	58,648	71,510
Marketable securities held to maturity	156,925	163,164
Loans, net	1,720,595	1,645,444
Accrued interest receivable	7,825	9,292
Nonmarketable equity securities	11,644	14,937
Cash surrender value of life insurance	34,280	26,301
Financial liabilities:
Deposits	1,963,313	1,871,480
Securities sold under repurchase agreements	11,363	12,228
Accrued interest payable	1,719	1,651
Federal Home Loan Bank advances	60,623	115,136
Subordinated debentures	11,310	12,810
Fair Value
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	58,648	71,510
Marketable securities held to maturity	162,165	162,800
Loans, net	1,719,467	1,630,600
Accrued interest receivable	7,825	9,292
Nonmarketable equity securities	11,644	14,937
Cash surrender value of life insurance	34,280	26,301
Financial liabilities:
Deposits	1,966,565	1,870,632
Securities sold under repurchase agreements	11,363	12,228
Accrued interest payable	1,719	1,651
Federal Home Loan Bank advances	60,634	114,934
Subordinated debentures	9,153	10,724
Fair Value | Level 1 Inputs
Financial assets:
Cash, due from banks, federal funds sold and interest-bearing deposits	58,648	71,510
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	1,432,490	1,435,985
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	162,165	162,800
Loans, net	0	0
Accrued interest receivable	7,825	9,292
Nonmarketable equity securities	11,644	14,937
Cash surrender value of life insurance	34,280	26,301
Financial liabilities:
Deposits	534,075	434,647
Securities sold under repurchase agreements	11,363	12,228
Accrued interest payable	1,719	1,651
Federal Home Loan Bank advances	60,634	114,934
Subordinated debentures	9,153	10,724
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	1,719,467	1,630,600
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