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Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Investments, Debt and Equity Securities [Abstract] |  |
Debt Securities Available for Sale, Due in one year or less, Amortized Cost | $ 31,863 |
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost | 971,094 |
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost | 2,336,366 |
Debt Securities Available for Sale, Due after ten years, Amortized Cost | 2,505,722 |
Securities Available for Sale, Amortized Cost | 5,845,045 | $ 5,774,133
Debt Securities Available for Sale, Due in one year or less, Fair Value | 31,963 |
Debt Securities Available for Sale, Due after one year through five years, Fair Value | 950,634 |
Debt Securities Available for Sale, Due after five years through ten years, Fair Value | 2,146,246 |
Debt Securities Available for Sale, Due after ten years, Fair Value | 2,205,685 |
Total available for sale debt securities, Fair Value | 5,334,528 | 5,161,491
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost | 110,832 |
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost | 764,462 |
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost | 536,603 |
Debt Securities Held to Maturity, Due after ten years, Amortized Cost | 948,544 |
Securities Held to Maturity, Gross Amortized Cost | 2,360,441 | 2,435,663
Debt Securities Held to Maturity, Due in one year or less, Fair Value | 110,453 |
Debt Securities Held to Maturity, Due after one year through five years, Fair Value | 733,857 |
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value | 505,119 |
Debt Securities Held to Maturity, Due after ten years, Fair Value | 845,198 |
Total held to maturity securities, Fair Value | $ 2,194,627 | $ 2,233,526

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