v3.25.2
Securities Available for Sale and Held to Maturity - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
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 $ 41,500,000   $ 41,500,000   $ 46,600,000  
Credit loss recognized 0   0   0  
Expected credit losses, current.     0   0  
Reserve for securities held to maturity 0   0   0  
Securities held to maturity 1,290,572,000   1,290,572,000   1,335,385,000  
Securities available for sale 1,782,092,000   1,782,092,000   1,692,534,000  
Available for sale securities, average yield   4.85%   4.85%    
Gross realized losses 0 $ (182,792,000) 0 $ (182,792,000)    
Net unamortized, unrealized loss on transfer of securities, net of tax   137,100,000   137,100,000    
Purchases of securities available for sale   1,378,000,000 137,765,000 1,382,457,000    
Pledged to collateralize public deposits and securities sold under repurchase agreements and for other purposes as permitted by law 1,783,000,000   1,783,000,000   1,910,000,000  
Pledged securities providing additional contingency funding 0   0   0  
Past Due 30 to 59 Days [Member]            
Schedule of Available For Sale and Held to Maturity Securities [Line Items]            
Securities held to maturity 0   0   0  
Securities Available for Sale [Member]            
Schedule of Available For Sale and Held to Maturity Securities [Line Items]            
Accrued interest receivable 5,600,000   5,600,000   5,000,000  
Securities Held to Maturity [Member]            
Schedule of Available For Sale and Held to Maturity Securities [Line Items]            
Accrued interest receivable 2,300,000   2,300,000   2,400,000  
Held-to-maturity nonnaccrual $ 0   $ 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   $ 1,561,000,000    
Available for sale securities, average yield   1.36%   1.36%