Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance				$ 61,630	$ 57,670
Total other comprehensive (loss) income		$ (1,111)	$ 167	(3,399)	1,170
Ending balance		62,045	61,734	62,045	61,734
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	[1]	(4,178)	(1,895)	(1,787)	(2,909)
Other comprehensive income (loss) before reclassification	[1]	(1,103)	168	(3,511)	1,202
Amount reclassified from accumulated other comprehensive income (loss)	[1]		4	17	(16)
Total other comprehensive (loss) income	[1]	(1,103)	172	(3,494)	1,186
Ending balance	[1]	(5,281)	(1,723)	(5,281)	(1,723)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	[1]	65	(63)	(38)	(52)
Other comprehensive income (loss) before reclassification	[1]	(8)	(5)	95	(16)
Total other comprehensive (loss) income	[1]	(8)	(5)	95	(16)
Ending balance	[1]	$ 57	$ (68)	$ 57	$ (68)

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