GOODWILL AND INTANGIBLE ASSETS - Changes in carrying values of goodwill and intangible assets (Details) - Changes in carrying values of goodwill and intangible assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill (1)
Balance, beginning of period	$ 12,552	$ 12,552	$ 9,829
Additions			2,723
Impairment
Balance, end of period	12,552	12,552	12,552
Core Deposit Intangibles
Cost, beginning of period	5,248	5,248	2,543
Union Savings branch purchase			490
Riverside Bank merger			2,215
Impairment
Cost, end of period	5,248	5,248	5,248
Amortization, beginning of period	(2,910)	(2,258)	(1,967)
Amortization	(601)	(652)	(291)
Amortization, end of period	(3,511)	(2,910)	(2,258)
Core deposit intangibles, net	$ 1,737	$ 2,338	$ 2,990