Accumulated 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), Net of Tax	$ 35,162	$ 182,195	$ 40,367	$ (35,305)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(136,920)	148,190	77,520
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(10,113)	(6,362)	(1,848)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(147,033)	141,828	75,672
Unrealized Gains and Losses on Available-for-Sale Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	23,134	163,174	33,038	(33,128)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(137,482)	130,355	67,802
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(2,558)	(219)	(1,636)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(140,040)	130,136	66,166
Unrealized Gains and Losses on Pension Plan Liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(4,812)	(5,833)	(3,974)	(2,177)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	562	(2,177)	(2,042)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	459	318	245
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1,021	(1,859)	(1,797)
Unrealized Gains and Losses from Hedging Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	16,840	24,854	11,303	$ 0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	20,012	11,760
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(8,014)	(6,461)	(457)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (8,014)	$ 13,551	$ 11,303