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Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]    
Debt Securities Available for Sale, Due in one year or less, Amortized Cost $ 35,304  
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost 1,382,114  
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost 2,091,263  
Debt Securities Available for Sale, Due after ten years, Amortized Cost 2,778,765  
Securities Available for Sale, Amortized Cost 6,287,446 $ 6,341,322
Debt Securities Available for Sale, Due in one year or less, Fair Value 35,323  
Debt Securities Available for Sale, Due after one year through five years, Fair Value 1,360,911  
Debt Securities Available for Sale, Due after five years through ten years, Fair Value 2,020,407  
Debt Securities Available for Sale, Due after ten years, Fair Value 2,559,745  
Total debt securities available for sale, Fair Value 5,976,386 5,961,917
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost 139,208  
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost 701,252  
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost 419,862  
Debt Securities Held to Maturity, Due after ten years, Amortized Cost 791,306  
Securities Held to Maturity, Gross Amortized Cost 2,051,628 2,132,882
Debt Securities Held to Maturity, Due in one year or less, Fair Value 138,554  
Debt Securities Held to Maturity, Due after one year through five years, Fair Value 678,711  
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value 397,573  
Debt Securities Held to Maturity, Due after ten years, Fair Value 711,891  
Total debt securities held to maturity, Fair Value $ 1,926,729 $ 2,011,026