Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Securities gains, net	$ 323	$ 121
Income taxes	(1,571)	(1,406)
Net income (loss)	6,003	5,812
Reclassifications	3	6
Realized gain on call of securities
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications	3	6
Amount Reclassified from AOCI
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	3
Reclassifications		656
Amount Reclassified from AOCI | Realized gain on call of securities
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Securities gains, net	4	8
Income taxes	$ (1)	(2)
Net income (loss)		6
Amount Reclassified from AOCI | Adjustments Related to Pension Benefits
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications		$ 650