Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (510,495)	$ 35,162	$ 182,195	$ 40,367
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(531,729)	(136,920)	148,190
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(13,928)	(10,113)	(6,362)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(545,657)	(147,033)	141,828
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	(519,195)	23,134	163,174	33,038
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(536,262)	(137,482)	130,355
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(6,067)	(2,558)	(219)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(542,329)	(140,040)	130,136
Unrealized Gains and Losses on Pension Plan Liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	123	(4,812)	(5,833)	(3,974)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	4,533	562	(2,177)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	402	459	318
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	4,935	1,021	(1,859)
Unrealized Gains and Losses from Hedging Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	8,577	16,840	24,854	$ 11,303
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0	20,012
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(8,263)	(8,014)	(6,461)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (8,263)	$ (8,014)	$ 13,551