Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Combined Federal And State Income Tax Rate	24.00%	23.00%
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 5,840	$ (14,482)
Other comprehensive (loss) income before reclassifications	24,252	20,376
Amounts reclassified from other comprehensive income (loss)	(47)	(54)
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment, after Tax	1,188
Other Comprehensive Income (Loss), Net of Tax	25,393	20,322	$ (6,181)
Ending balance	31,233	5,840	(14,482)
Defined Benefit Pension Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(6,270)	(5,871)
Other comprehensive (loss) income before reclassifications	609	(399)
Amounts reclassified from other comprehensive income (loss)	0	0
Other Comprehensive Income (Loss), Net of Tax	609	(399)
Ending balance	(5,661)	(6,270)	(5,871)
Unrealized Gains (Losses) on Securities Available-for-Sale
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	12,110	(8,611)
Other comprehensive (loss) income before reclassifications	23,643	20,775
Amounts reclassified from other comprehensive income (loss)	(47)	(54)
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment, after Tax	1,188
Other Comprehensive Income (Loss), Net of Tax	24,784	20,721
Ending balance	$ 36,894	$ 12,110	$ (8,611)