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Investment Securities (Schedule Of Contractual Maturities Of Investment Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Investment Holdings [Line Items] |  |
Available-for-sale securities, due within one year, amortized cost | $ 71,438 |
Available-for-sale securities, after one year through five years, amortized cost | 2,127,299 |
Available-for-sale securities, after five years through ten years, amortized cost | 2,388,442 |
Available-for-sale securities, after ten years, amortized cost | 4,675,598 |
Available-for-sale securities, amortized cost | 9,262,777 | $ 3,738,281
Available-for-sale securities, due within one year, fair value | 70,451 |
Available-for-sale securities, after one year through five years, fair value | 2,106,753 |
Available-for-sale securities, after five years through ten years, fair value | 2,323,581 |
Available-for-sale securities, after ten years, fair value | 4,329,085 |
Available-for-sale securities, fair value | 8,829,870 | 3,196,166
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 | 2,295 |
Held to maturity, at amortized cost | 2,300 | 2,476
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 | 67 |
Held-to-maturity securities, after ten years, fair value | 2,956 |
Held-to-maturity securities, fair value | $ 3,025 | $ 3,197

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