Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance				$ 64,918
Total other comprehensive income (loss)		$ 1,400	$ (1,111)	4,917	$ (3,399)
Ending balance		74,153	62,045	74,153	62,045
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	[1]	(183)	(4,178)	(3,686)	(1,787)
Other comprehensive income (loss) before reclassification	[1]	1,393	(1,103)	4,861	(3,511)
Amount reclassified from accumulated other comprehensive income or loss	[1]			35	17
Total other comprehensive income (loss)	[1]	1,393	(1,103)	4,896	(3,494)
Ending balance	[1]	1,210	(5,281)	1,210	(5,281)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	[1]	44	65	30	(38)
Other comprehensive income (loss) before reclassification	[1]	7	(8)	21	95
Total other comprehensive income (loss)	[1]	7	(8)	21	95
Ending balance	[1]	$ 51	$ 57	$ 51	$ 57

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