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Securities Available for Sale and Held to Maturity - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Reclassification of Securities available for sale to securities held to maturity         $ 766,000,000
Net unrealized holding loss on AFS Securities at date of transfer         91,900,000
Net unrealized holding losses on AFS Securities, net of tax at date of transfer         $ (68,900,000)
Net unamortized, unrealized loss on transfer of securities   $ 36,300,000 $ 46,600,000    
Credit loss recognized   0 0    
Expected credit losses, current.   0 0    
Reserve for securities held to maturity   0 0    
Securities held to maturity   1,207,454,000 1,335,385,000    
Securities available for sale   1,876,830,000 1,692,534,000    
Available for sale securities, average yield 4.85%        
Gross realized losses $ 182,800,000 0 182,792,000 $ 8,000  
Net unamortized, unrealized loss on transfer of securities, net of tax (137,100,000)        
Purchases of securities available for sale 1,378,000,000 317,685,000 1,555,065,000 $ 0  
Pledged to collateralize public deposits and securities sold under repurchase agreements and for other purposes as permitted by law   1,709,000,000 1,910,000,000    
Pledged securities providing additional contingency funding   0 0    
30 Days or More Past Due [Member]          
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Securities held to maturity   0 0    
Securities Available for Sale [Member]          
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Accrued interest receivable   5,900,000 5,000,000    
Securities Held to Maturity [Member]          
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Accrued interest receivable   2,100,000 2,400,000    
Held-to-maturity nonnaccrual   $ 0 $ 0    
Investment Securities Portfolio [Member]          
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Securities available for sale $ 1,561,000,000        
Available for sale securities, average yield 1.36%