v3.26.1
Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]    
Debt Securities Available for Sale, Due in one year or less, Amortized Cost $ 36,421  
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost 1,471,156  
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost 2,336,915  
Debt Securities Available for Sale, Due after ten years, Amortized Cost 2,496,453  
Securities Available for Sale, Amortized Cost 6,340,945 $ 6,341,322
Debt Securities Available for Sale, Due in one year or less, Fair Value 36,425  
Debt Securities Available for Sale, Due after one year through five years, Fair Value 1,438,607  
Debt Securities Available for Sale, Due after five years through ten years, Fair Value 2,237,926  
Debt Securities Available for Sale, Due after ten years, Fair Value 2,293,262  
Total debt securities available for sale, Fair Value 6,006,220 5,961,917
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost 101,001  
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost 660,247  
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost 358,843  
Debt Securities Held to Maturity, Due after ten years, Amortized Cost 765,048  
Securities Held to Maturity, Gross Amortized Cost 1,885,139 2,132,882
Debt Securities Held to Maturity, Due in one year or less, Fair Value 100,705  
Debt Securities Held to Maturity, Due after one year through five years, Fair Value 634,985  
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value 337,242  
Debt Securities Held to Maturity, Due after ten years, Fair Value 682,651  
Total debt securities held to maturity, Fair Value $ 1,755,583 $ 2,011,026