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Investment Securities (Schedule Of Contractual Maturities Of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale securities, due within one year, amortized cost | $ 141,688 |
Available-for-sale securities, after one year through five years, amortized cost | 2,259,829 |
Available-for-sale securities, after five years through ten years, amortized cost | 2,187,571 |
Available-for-sale securities, after ten years, amortized cost | 4,583,038 |
Available-for-sale securities, amortized cost | 9,172,126 | $ 9,262,777
Available-for-sale securities, due within one year, fair value | 139,856 |
Available-for-sale securities, after one year through five years, fair value | 2,213,929 |
Available-for-sale securities, after five years through ten years, fair value | 2,103,386 |
Available-for-sale securities, after ten years, fair value | 4,159,374 |
Debt Securities, Available-for-sale | 8,616,545 | 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 | 2 |
Held-to-maturity securities, after five years through ten years, amortized cost | 3 |
Held-to-maturity securities, after ten years, amortized cost | 2,242 |
Investment securities held to maturity | 2,247 | 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 | 2 |
Held-to-maturity securities, after five years through ten years, fair value | 64 |
Held-to-maturity securities, after ten years, fair value | 2,873 |
Held-to-maturity securities, fair value | $ 2,939 | $ 3,025

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