Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			$ (7,012)			$ (7,012)
Period change		$ 1,561	1,096	$ 463	$ (1,074)	2,657	$ (611)
Balance		(4,355)				(4,355)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[1]	(5,916)	(7,012)	(8,029)	(6,955)	(7,012)	(6,955)
Other comprehensive (loss) gain before reclassifications	[1]	1,460		315		2,485	(760)
Amounts reclassified from accumulated other comprehensive loss	[1]	101		148		172	149
Period change	[1]	1,561		463		2,657	(611)
Balance	[1]	(4,355)	(5,916)	(7,566)	(8,029)	(4,355)	(7,566)
Accumulated Other Comprehensive Loss | Defined Benefit Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[1]	(284)	(339)	(534)	(534)	(339)	(534)
Other comprehensive (loss) gain before reclassifications	[1]	(32)		650		(48)	650
Amounts reclassified from accumulated other comprehensive loss	[1],[2]	70		148		141	148
Period change	[1]	38		798		93	798
Balance	[1]	(246)	(284)	264	(534)	(246)	264
Accumulated Other Comprehensive Loss | Unrealized gains (losses) on available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[1]	(5,632)	(6,673)	(7,495)	(6,421)	(6,673)	(6,421)
Other comprehensive (loss) gain before reclassifications	[1]	1,492		(335)		2,533	(1,410)
Amounts reclassified from accumulated other comprehensive loss	[1],[3]	31		0		31	1
Period change	[1]	1,523		(335)		2,564	(1,409)
Balance	[1]	$ (4,109)	$ (5,632)	$ (7,830)	$ (7,495)	$ (4,109)	$ (7,830)

[1] All amounts are net of tax. Related income tax expense or benefit is calculated using an income tax rate of 21.0 %.

[2] Included in the computation of net periodic pension cost. See Note 9, "Employee Benefits" for additional details.

[3] For additional details related to unrealized gains and losses on securities and related amounts reclassified from accumulated other comprehensive loss see Note 2, "Investment Securities."