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Accumulated Other Comprehensive Income - AOCI Reclass to IS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Other Noninterest Expense $ (15,132) $ (14,748) $ (46,423) $ (43,207)
Provision (Benefit) for Income Taxes 14,409 12,278 39,388 35,475
Net of Tax 53,345 40,358 144,967 110,832
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Net of Tax (4,492) (4,730) (13,466) (14,250)
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 (5,796) (6,207) (17,374) (18,703)
Provision (Benefit) for Income Taxes 1,536 1,645 4,605 4,958
Net of Tax (4,260) (4,562) (12,769) (13,745)
Reclassification out of Accumulated Other Comprehensive Income | Defined Benefit Plans, Net        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Other Noninterest Expense (317) (229) (949) (689)
Provision (Benefit) for Income Taxes 85 61 252 184
Net of Tax (232) (168) (697) (505)
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 62 184 184
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) $ (1,133) $ (873)