COMPREHENSIVE INCOME - Components of comprehensive income (Details) - Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income	$ 8,457	$ 2,521	$ 4,083
Other comprehensive (loss) income
Net unrealized (losses) gains on securities available-for-sale	(1,297)	$ 2,534	$ (3,743)
Reclassification of net realized gains in net income	(192)
Unrealized (losses) gains on securities available-for-sale	(1,489)	$ 2,534	$ (3,743)
Income tax benefit (expense)	506	(862)	1,273
Unrealized (losses) gains on securities available-for-sale, net of tax	$ (983)	1,672	(2,470)
Pension plan (expense) income (see Note 14)		(924)	1,635
Income tax benefit (expense)		314	(556)
Pension plan (expense) income, net of tax		(610)	1,079
Other comprehensive (loss) income, net of tax	$ (983)	1,062	(1,391)
Comprehensive income	$ 7,474	$ 3,583	$ 2,692