Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Combined Federal And State Income Tax Rate	23.00%	23.00%
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (14,482)	$ (5,644)
Other comprehensive loss before reclassifications	20,376	(6,306)
Amounts reclassified from other comprehensive loss	(54)	125
Other Comprehensive Income (Loss), Net of Tax	20,322	(6,181)	$ 2,367
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		0	0
Ending balance	5,840	(14,482)	(5,644)
Defined Benefit Pension Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(5,871)	(5,033)
Other comprehensive loss before reclassifications	(399)	(963)
Amounts reclassified from other comprehensive loss	0	125
Other Comprehensive Income (Loss), Net of Tax	(399)	(838)
Ending balance	(6,270)	(5,871)	(5,033)
Unrealized Gains (Losses) on Securities Available-for-Sale
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(8,611)	(611)
Other comprehensive loss before reclassifications	20,775	(5,343)
Amounts reclassified from other comprehensive loss	(54)	0
Other Comprehensive Income (Loss), Net of Tax	20,721	(5,343)
Ending balance	12,110	(8,611)	(611)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	$ 20,322	(6,181)	$ 2,367
Accounting Standards Update 2016-01 [Member] | Defined Benefit Pension Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		0
Accounting Standards Update 2016-01 [Member] | Unrealized Gains (Losses) on Securities Available-for-Sale
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		(2,657)
Accounting Standards Update 2016-01 [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ (2,657)