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Investment Securities (Narrative) (Details)
 3 Months Ended
Mar. 31, 2026
USD ($)
shares
Dec. 31, 2025
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Percentage decrease requiring a review for impairment 20.00%  
Fair value of securities on impairment watch list $ 970,500,000 $ 896,700,000
Debt Securities, Available-for-sale, Unrealized Loss Position 6,347,485,000 5,882,003,000
Unrealized Loss on AFS Debt Securities 711,443,000 692,094,000
AFS securities in loss position at period-end, change in unrealized loss 19,300,000  
Securities pledged as collateral $ 6,700,000,000 7,300,000,000
Number of investments in a single issuer that exceed 10% of stockholder's equity 0  
No investment in a single issuer exceeds this percentage of stockholder's equity 10.00%  
U.S. government and federal agency obligations    
Debt Securities, Available-for-sale [Line Items]    
U.S. Treasury inflation-protected securities held, at fair value $ 380,700,000  
Debt Securities, Available-for-sale, Unrealized Loss Position 1,511,727,000 926,173,000
Unrealized Loss on AFS Debt Securities $ 16,400,000 $ 10,864,000
Visa Class B-2 Shares    
Debt Securities, Available-for-sale [Line Items]    
Equity Securities without Readily Determinable Fair Value, Shares | shares 411,723  
Equity Securities without Readily Determinable Fair Value, Carrying Value $ 0  
Private Equity Securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value other securities adjustments, net $ 10,900,000