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Investment Securities (Schedule Of Contractual Maturities Of Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]    
Available-for-sale securities, due within one year, amortized cost $ 235,915  
Available-for-sale securities, after one year through five years, amortized cost 2,522,197  
Available-for-sale securities, after five years through ten years, amortized cost 1,869,811  
Available-for-sale securities, after ten years, amortized cost 4,342,266  
Available-for-sale securities, amortized cost 8,970,189 $ 9,262,777
Available-for-sale securities, due within one year, fair value 236,109  
Available-for-sale securities, after one year through five years, fair value 2,518,639  
Available-for-sale securities, after five years through ten years, fair value 1,847,495  
Available-for-sale securities, after ten years, fair value 4,074,564  
Debt Securities, Available-for-sale 8,676,807 8,829,870
Held-to-maturity securities, due within one year, amortized cost 0  
Held-to-maturity securities, after one year through five years, amortized cost 3  
Held-to-maturity securities, after five years through ten years, amortized cost 1  
Held-to-maturity securities, after ten years, amortized cost 2,155  
Investment securities held to maturity 2,159 2,300
Held-to-maturity securities, due within one year, fair value 0  
Held-to-maturity securities, after one year through five years, fair value 3  
Held-to-maturity securities, after five years through ten years, fair value 433  
Held-to-maturity securities, after ten years, fair value 2,359  
Held-to-maturity securities, fair value $ 2,795 $ 3,025