Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance		$ 64,918	$ 61,630
Total other comprehensive income (loss)		1,878	(2,365)
Ending balance		68,319	60,127
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	[1]	(3,686)	(1,787)
Other comprehensive income (loss) before reclassification	[1]	1,871	(2,341)
Amount reclassified from accumulated other comprehensive loss	[1]		(16)
Total other comprehensive income (loss)	[1]	1,871	(2,357)
Ending balance	[1]	(1,815)	(4,144)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	[1]	30	(38)
Other comprehensive income (loss) before reclassification	[1]	7	(8)
Total other comprehensive income (loss)	[1]	7	(8)
Ending balance	[1]	$ 37	$ (46)

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