Accumulated Other Comprehensive Income (loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance		$ 57,670	$ 56,684
Total other comprehensive (loss) income		(1)	533
Ending balance		58,054	58,270
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	[1]	(2,909)	(147)
Other comprehensive income (loss) before reclassification	[1]	10	756
Amount reclassified from accumulated other comprehensive income (loss)	[1]	(6)	(236)
Total other comprehensive (loss) income	[1]	4	520
Ending balance	[1]	(2,905)	373
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	[1]	(52)	(91)
Other comprehensive income (loss) before reclassification	[1]	(5)	13
Total other comprehensive (loss) income	[1]	(5)	13
Ending balance	[1]	$ (57)	$ (78)

[1] All amounts are net of tax. Amounts in parentheses indicate debits.