Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		$ (7,012)
Period change		1,096	$ (1,074)
Balance		(5,916)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[1]	(7,012)	(6,955)
Other comprehensive (loss) gain before reclassifications	[1]	1,025	(1,073)
Amounts reclassified from accumulated other comprehensive loss	[1],[2]	70	(1)
Period change	[1]	1,096	(1,074)
Balance	[1]	(5,916)	(8,029)
Accumulated Other Comprehensive Loss | Defined Benefit Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[1]	(339)	(534)
Other comprehensive (loss) gain before reclassifications	[1]	(15)	0
Amounts reclassified from accumulated other comprehensive loss	[1],[3]	70	0
Period change	[1]	55	0
Balance	[1]	(284)	(534)
Accumulated Other Comprehensive Loss | Unrealized gains (losses) on available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[1]	(6,673)	(6,421)
Other comprehensive (loss) gain before reclassifications	[1]	1,041	(1,073)
Amounts reclassified from accumulated other comprehensive loss	[1],[2]	0	(1)
Period change	[1]	1,041	(1,074)
Balance	[1]	$ (5,632)	$ (7,495)

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

[2] 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."

[3] Included in the computation of net periodic pension cost. See Note 10, "Employee Benefits" for additional details.