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Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
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Investments, Debt and Equity Securities [Abstract] |  |
Debt Securities Available for Sale, Due in one year or less, Amortized Cost | $ 35,304 |
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost | 1,382,114 |
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost | 2,091,263 |
Debt Securities Available for Sale, Due after ten years, Amortized Cost | 2,778,765 |
Securities Available for Sale, Amortized Cost | 6,287,446 | $ 6,341,322
Debt Securities Available for Sale, Due in one year or less, Fair Value | 35,323 |
Debt Securities Available for Sale, Due after one year through five years, Fair Value | 1,360,911 |
Debt Securities Available for Sale, Due after five years through ten years, Fair Value | 2,020,407 |
Debt Securities Available for Sale, Due after ten years, Fair Value | 2,559,745 |
Total debt securities available for sale, Fair Value | 5,976,386 | 5,961,917
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost | 139,208 |
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost | 701,252 |
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost | 419,862 |
Debt Securities Held to Maturity, Due after ten years, Amortized Cost | 791,306 |
Securities Held to Maturity, Gross Amortized Cost | 2,051,628 | 2,132,882
Debt Securities Held to Maturity, Due in one year or less, Fair Value | 138,554 |
Debt Securities Held to Maturity, Due after one year through five years, Fair Value | 678,711 |
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value | 397,573 |
Debt Securities Held to Maturity, Due after ten years, Fair Value | 711,891 |
Total debt securities held to maturity, Fair Value | $ 1,926,729 | $ 2,011,026

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