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INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets, Gross [Abstract]
Allowance for loan losses	$ 3,507	$ 3,085
Deferred compensation	3,383	3,242
Unrealized gain or loss on securities available for sale		2,641
Unrealized gain or loss on derivatives	307	685
Non-accrual interest	381	374
Acquisition fair value adjustments	2,223	3,171
Equity compensation	468	335
Contract incentives	1,167	1,658
Lease liability	2,273
Other	160	217
Total	13,869	15,408
Deferred Tax Liabilities, Gross [Abstract]
Unrealized gain or loss on securities available for sale	1,858
Depreciation	1,722	1,517
Deferred loan origination costs	862	725
Branch acquisition costs and goodwill	712	784
Core deposit intangible	1,231	1,309
Prepaid expenses	311	215
Interest rate cap premium amortization		257
Mortgage servicing rights	703	721
Prepaid pension	359	366
Right of use asset	2,253
Total	$ 10,011	$ 5,894

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