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Investment Securities (Schedule Of Contractual Maturities Of Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]    
Available-for-sale securities, due within one year, amortized cost $ 190,692  
Available-for-sale securities, after one year through five years, amortized cost 2,352,102  
Available-for-sale securities, after five years through ten years, amortized cost 2,095,493  
Available-for-sale securities, after ten years, amortized cost 4,459,864  
Available-for-sale securities, amortized cost 9,098,151 $ 9,262,777
Available-for-sale securities, due within one year, fair value 189,169  
Available-for-sale securities, after one year through five years, fair value 2,289,382  
Available-for-sale securities, after five years through ten years, fair value 2,003,191  
Available-for-sale securities, after ten years, fair value 4,021,258  
Debt Securities, Available-for-sale 8,503,000 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 2,199  
Investment securities held to maturity 2,203 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 486  
Held-to-maturity securities, after ten years, fair value 2,396  
Held-to-maturity securities, fair value $ 2,885 $ 3,025