v3.26.1
Securities Available for Sale and Held to Maturity - Additional Information (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
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 $ 32,100,000   $ 36,300,000    
Credit loss recognized 0   0    
Expected credit losses, current 0   0    
Reserve for securities held to maturity 0   0 $ 0  
Securities held to maturity 1,134,823,000   1,207,454,000    
Gross realized gains 0 $ 0      
Gross realized losses 0 $ 0      
Pledged to collateralize public deposits and securities sold under repurchase agreements and for other purposes as permitted by law 1,734,000,000   1,709,000,000    
Pledged securities providing additional contingency funding 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    
Securities Available for Sale [Member]          
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Accrued interest receivable 6,200,000   5,900,000    
Securities Held to Maturity [Member]          
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Accrued interest receivable $ 2,000,000   $ 2,100,000