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Debt Securities (Schedule Of Contractual Maturities Of Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]    
Available-for-sale securities, due within one year, amortized cost $ 274,177  
Available-for-sale securities, after one year through five years, amortized cost 2,765,054  
Available-for-sale securities, after five years through ten years, amortized cost 1,458,634  
Available-for-sale securities, after ten years, amortized cost 4,573,495  
Available-for-sale securities, amortized cost 9,071,360 $ 8,858,329
Available-for-sale securities, due within one year, fair value 274,135  
Available-for-sale securities, after one year through five years, fair value 2,745,942  
Available-for-sale securities, after five years through ten years, fair value 1,417,224  
Available-for-sale securities, after ten years, fair value 4,215,871  
Debt Securities, Available-for-sale 8,653,172 8,274,615
Held-to-maturity securities, due within one year, amortized cost 0  
Held-to-maturity securities, after one year through five years, amortized cost 2  
Held-to-maturity securities, after five years through ten years, amortized cost 1  
Held-to-maturity securities, after ten years, amortized cost 2,010  
Investment securities held to maturity 2,013 2,101
Held-to-maturity securities, due within one year, fair value 0  
Held-to-maturity securities, after one year through five years, fair value 2  
Held-to-maturity securities, after five years through ten years, fair value 541  
Held-to-maturity securities, after ten years, fair value 2,042  
Held-to-maturity securities, fair value $ 2,585 $ 2,703