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Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]    
Debt Securities Available for Sale, Due in one year or less, Amortized Cost $ 31,996  
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost 1,766,369  
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost 1,829,382  
Debt Securities Available for Sale, Due after ten years, Amortized Cost 2,713,575  
Securities Available for Sale, Amortized Cost 6,341,322 $ 5,774,133
Debt Securities Available for Sale, Due in one year or less, Fair Value 32,084  
Debt Securities Available for Sale, Due after one year through five years, Fair Value 1,711,795  
Debt Securities Available for Sale, Due after five years through ten years, Fair Value 1,743,201  
Debt Securities Available for Sale, Due after ten years, Fair Value 2,474,837  
Total debt securities available for sale, Fair Value 5,961,917 5,161,491
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost 141,124  
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost 666,314  
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost 475,596  
Debt Securities Held to Maturity, Due after ten years, Amortized Cost 849,848  
Securities Held to Maturity, Gross Amortized Cost 2,132,882 2,435,663
Debt Securities Held to Maturity, Due in one year or less, Fair Value 140,203  
Debt Securities Held to Maturity, Due after one year through five years, Fair Value 648,904  
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value 452,476  
Debt Securities Held to Maturity, Due after ten years, Fair Value 769,443  
Total debt securities held to maturity, Fair Value $ 2,011,026 $ 2,233,526