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INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets, Gross [Abstract]
Allowance for loan losses	$ 3,085	$ 2,729
Deferred compensation	3,242	3,333
Unrealized gain or loss on securities available for sale	2,641	649
Unrealized gain or loss on derivatives	685	853
Non-accrual interest	374	273
Core deposit intangible		0
Acquisition fair value adjustments	3,171	4,000
Equity compensation	335	297
Contract incentives	1,658	594
Other	217	417
Total	15,408	13,145
Deferred Tax Liabilities, Gross [Abstract]
Depreciation	1,517	1,356
Deferred loan origination costs	725	655
Branch acquisition costs and goodwill	784	737
Core deposit intangible	1,309	1,525
Prepaid expenses	215	302
Interest rate cap premium amortization	257	276
Mortgage servicing rights	721	769
Prepaid pension	366	345
Other		0
Total	$ 5,894	$ 5,965

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