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Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 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 | $ 3,810 |
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost | 240,883 |
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost | 2,457,451 |
Debt Securities Available for Sale, Due after ten years, Amortized Cost | 3,064,090 |
Securities Available for Sale, Gross Amortized Cost | 5,766,234 | $ 4,637,610
Debt Securities Available for Sale, Due in one year or less, Fair Value | 3,810 |
Debt Securities Available for Sale, Due after one year through five years, Fair Value | 260,170 |
Debt Securities Available for Sale, Due after five years through ten years, Fair Value | 2,587,529 |
Debt Securities Available for Sale, Due after ten years, Fair Value | 3,147,818 |
Total available for sale debt securities, Fair Value | 5,999,327 | 4,675,304
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost | 2,192 |
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost | 204,134 |
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost | 636,268 |
Debt Securities Held to Maturity, Due after ten years, Amortized Cost | 514,576 |
Total held to maturity debt securities, Amortized Cost | 1,357,170 | 1,568,009
Debt Securities Held to Maturity, Due in one year or less, Fair Value | 2,190 |
Debt Securities Held to Maturity, Due after one year through five years, Fair Value | 218,501 |
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value | 702,412 |
Debt Securities Held to Maturity, Due after ten years, Fair Value | 544,478 |
Total held to maturity debt securities, Fair Value | $ 1,467,581 | $ 1,611,004

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