Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains, net	$ 607	$ 123	$ 812
Income taxes	(4,861)	(5,646)	(10,826)
Net Income	20,906	22,579	15,249
Reclassification of stranded tax effects from tax rate change			(545)
Total reclassifications	215	63	528
Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of stranded tax effects from tax rate change	0	0	141
Reclassification for ASU 2016-01 adoption	0	650	0
Total reclassifications	215	713	1,073
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			(141)
Reclassification for ASU 2016-01 adoption			(650)
Total reclassifications	215	63	528
Realized gain on sale of securities | Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains, net	274	81	812
Income taxes	(59)	(18)	(284)
Net Income	215	63	528
Adjustments Related to Pension Benefits
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of stranded tax effects from tax rate change			(404)
Adjustments Related to Pension Benefits | Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications	$ 0	$ 0	$ 404