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Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Investments, Debt and Equity Securities [Abstract] |  |
Debt Securities Available for Sale, Due in one year or less, Amortized cost | $ 101,999 |
Debt Securities Available for Sale, Due after one year through five years, Amortized cost | 814,705 |
Debt Securities Available for Sale, Due after five years through ten years, Amortized cost | 2,344,169 |
Debt Securities Available for Sale, Due after ten years, Amortized cost | 2,344,976 |
Securities Available for Sale, Gross Amortized cost | 5,605,849 | $ 5,496,718
Debt Securities Available for Sale, Due in one year or less, Fair value | 101,229 |
Debt Securities Available for Sale, Due after one year through five years, Fair value | 779,834 |
Debt Securities Available for Sale, Due after five years through ten years, Fair value | 2,092,416 |
Debt Securities Available for Sale, Due after ten years, Fair value | 1,991,735 |
Total available for sale debt securities, Fair value | 4,965,214 | 4,915,195
Debt Securities Held to Maturity, Due in one year or less, Amortized cost | 158,621 |
Debt Securities Held to Maturity, Due after one year through five years, Amortized cost | 790,154 |
Debt Securities Held to Maturity, Due after five years through ten years, Amortized cost | 569,629 |
Debt Securities Held to Maturity, Due after ten years, Amortized cost | 1,052,218 |
Securities Held to Maturity, Gross Amortized cost | 2,570,622 | 2,684,779
Debt Securities Held to Maturity, Due in one year or less, Fair value | 156,501 |
Debt Securities Held to Maturity, Due after one year through five years, Fair value | 740,272 |
Debt Securities Held to Maturity, Due after five years through ten years, Fair value | 530,008 |
Debt Securities Held to Maturity, Due after ten years, Fair value | 921,176 |
Total held to maturity debt securities, Fair value | $ 2,347,957 | $ 2,485,918

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