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Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Investments Debt And Equity Securities [Abstract] |  |
Debt Securities Available for Sale, Due in one year or less, Amortized Cost | $ 14,492 |
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost | 239,148 |
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost | 2,066,697 |
Debt Securities Available for Sale, Due after ten years, Amortized Cost | 3,090,165 |
Securities Available for Sale, Gross Amortized Cost | 5,410,502 | $ 4,637,610
Debt Securities Available for Sale, Due in one year or less, Fair Value | 14,540 |
Debt Securities Available for Sale, Due after one year through five years, Fair Value | 258,655 |
Debt Securities Available for Sale, Due after five years through ten years, Fair Value | 2,196,332 |
Debt Securities Available for Sale, Due after ten years, Fair Value | 3,177,788 |
Total available for sale debt securities, Fair Value | 5,647,315 | 4,675,304
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost | 2,196 |
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost | 189,141 |
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost | 636,976 |
Debt Securities Held to Maturity, Due after ten years, Amortized Cost | 580,648 |
Total held to maturity debt securities, Amortized Cost | 1,408,961 | 1,568,009
Debt Securities Held to Maturity, Due in one year or less, Fair Value | 2,191 |
Debt Securities Held to Maturity, Due after one year through five years, Fair Value | 201,869 |
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value | 701,345 |
Debt Securities Held to Maturity, Due after ten years, Fair Value | 612,283 |
Total held to maturity debt securities, Fair Value | $ 1,517,688 | $ 1,611,004

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