Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	$ 5,792	$ 34,421	$ 26,674	$ 29,672
Accumulated Other Comprehensive Income (Loss), Debt Securities, Available-for-sale, Adjustment, after Tax	21,153	40,690	17,539	(20,116)
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax	(206)	(698)	(454)	0
Accumulated Other Comprehensive Income (Loss), Net of Tax	15,155	5,571	(9,589)	$ (49,788)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	(26,875)	8,675	(1,511)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax	(19,537)	25,747	37,322
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	492	(244)	(454)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	7,830	16,828	38,379
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	1,754	928	1,487
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	0	2,596	(333)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	0	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(1,754)	1,668	(1,820)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(28,629)	7,747	(2,998)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax	(19,537)	23,151	37,655
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	492	(244)	(454)
Other Comprehensive Income (Loss), Net of Tax	9,584	15,160	40,199
Debt Securities, Held-to-maturity, Transfer, Amount			373,900
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax			24,200
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax	0	0	19,095
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	2,220	1,175	1,882
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	2,220	1,175	1,882
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax	466	247	395
Gain (Loss) on Sale of Investments	0	3,286	(421)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax	0	(3,286)	421
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	0	(690)	88
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gain (Loss) on Sale of Investments	0	3,286	(421)
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 0	$ (2,596)	$ 333