INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Allowance for loan losses	$ 9,177	$ 7,750
Unrealized losses on securities	890	0
Deferred Tax Assets, Goodwill and Intangible Assets	436	351
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	696	712
Other	241	55
Total deferred tax assets	11,440	8,868
Deferred tax liabilities:
Premises and equipment	3,318	3,634
Goodwill	1,820	1,446
FHLB stock dividends	80	70
Deferred Tax Liabilities, Derivatives	346	0
Unrealized gains on securities	0	274
Deferred Tax Liabilities, Prepaid Expenses	306	323
Deferred Tax Liabilities, Investments	753	854
Other	245	95
Total deferred tax liabilities	6,868	6,696
Net deferred tax asset	$ 4,572	$ 2,172