COMPREHENSIVE INCOME - Components of comprehensive income (Details) (Statements of Comprehensive Income, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statements of Comprehensive Income
Net income	$ 2,521	$ 4,083	$ 4,077
Other comprehensive income (loss)
Net unrealized gains (losses) on securities available-for-sale	2,534	(3,743)	2,632
Reclassification of net realized gains in net income			(279)
Unrealized gains (losses) on securities available-for-sale	2,534	(3,743)	2,353
Income tax (expense) benefit	(862)	1,273	(800)
Unrealized gains (losses) on securities available-for-sale, net of tax	1,672	(2,470)	1,553
Pension plan (expense) income (see Note 14)	(924)	1,635	2,407
Income tax benefit (expense)	314	(556)	(818)
Pension plan (expense) income, net of tax	(610)	1,079	1,589
Other comprehensive income (loss), net of tax	1,062	(1,391)	3,142
Comprehensive income	$ 3,583	$ 2,692	$ 7,219