Accumulated Other Comprehensive Income - AOCI Reclass to IS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Provision (Benefit) for Income Taxes	$ 12,808	$ 11,224	$ 24,979	$ 23,197
Net of Tax	47,637	34,083	91,622	70,474
Other noninterest expense	(15,640)	(14,435)	(31,291)	(28,459)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net of Tax	(4,557)	(4,793)	(8,974)	(9,520)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of Unrealized Holding Losses on Investment Securities Held-to-Maturity
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Interest Income	(5,884)	(6,294)	(11,578)	(12,496)
Provision (Benefit) for Income Taxes	1,560	1,669	3,069	3,313
Net of Tax	(4,324)	(4,625)	(8,509)	(9,183)
Reclassification out of Accumulated Other Comprehensive Income | Defined Benefit Plans, Net
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Provision (Benefit) for Income Taxes	84	62	167	123
Net of Tax	(233)	(168)	(465)	(337)
Other noninterest expense	(317)	(230)	(632)	(460)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of Prior Service Credit
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Other noninterest expense	61	61	123	122
Reclassification out of Accumulated Other Comprehensive Income | Amortization of Net Actuarial Losses
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Other noninterest expense	$ (378)	$ (291)	$ (755)	$ (582)