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, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill (1)
Balance, beginning of period	$ 12,552	$ 9,829	$ 9,829
Additions		$ 2,723
Impairment
Balance, end of period	$ 12,552	$ 12,552	$ 9,829
Core Deposit Intangibles
Cost, beginning of period	$ 5,248	2,543	$ 2,543
Union Savings branch purchase		490
Riverside Bank merger		$ 2,215
Impairment
Cost, end of period	$ 5,248	$ 5,248	$ 2,543
Amortization, beginning of period	(2,258)	(1,967)	(1,745)
Amortization	(652)	(291)	(222)
Amortization, end of period	(2,910)	(2,258)	(1,967)
Core deposit intangibles, net	$ 2,338	$ 2,990	$ 576