Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains, net	$ 123	$ 812	$ 836
Income taxes	(5,646)	(10,826)	(7,007)
Net Income	22,579	15,249	16,301
Reclassification of stranded tax effects from tax rate change	(650)
Total reclassifications	63	528	543
Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of stranded tax effects from tax rate change	0	141	0
Reclassification for ASU 2016-01 adoption	650	0	0
Total reclassifications	713	1,073	543
Realized gain on sale of securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of stranded tax effects from tax rate change	(650)	(141)
Total reclassifications	63	528	543
Realized gain on sale of securities | Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains, net	81	812	836
Income taxes	(18)	(284)	(293)
Net Income	63	528	543
Adjustments Related to Pension Benefits
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of stranded tax effects from tax rate change	0	(404)
Adjustments Related to Pension Benefits | Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications	$ 0	$ 404	$ 0