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Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Investments Debt And Equity Securities [Abstract] |  |
Debt Securities Available for Sale, Due in one year or less, Amortized Cost | $ 691 |
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost | 687,364 |
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost | 2,902,497 |
Debt Securities Available for Sale, Due after ten years, Amortized Cost | 2,789,450 |
Securities Available for Sale, Gross Amortized Cost | 6,380,002 | $ 6,984,530
Debt Securities Available for Sale, Due in one year or less, Fair Value | 694 |
Debt Securities Available for Sale, Due after one year through five years, Fair Value | 681,925 |
Debt Securities Available for Sale, Due after five years through ten years, Fair Value | 2,715,517 |
Debt Securities Available for Sale, Due after ten years, Fair Value | 2,594,871 |
Total available for sale debt securities, Fair Value | 5,993,007 | 6,986,698
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost | 11,225 |
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost | 379,981 |
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost | 891,327 |
Debt Securities Held to Maturity, Due after ten years, Amortized Cost | 1,205,555 |
Total held to maturity debt securities, Amortized Cost | 2,488,088 | 1,565,751
Debt Securities Held to Maturity, Due in one year or less, Fair Value | 11,248 |
Debt Securities Held to Maturity, Due after one year through five years, Fair Value | 379,671 |
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value | 873,478 |
Debt Securities Held to Maturity, Due after ten years, Fair Value | 1,164,652 |
Total held to maturity debt securities, Fair Value | $ 2,429,049 | $ 1,631,482

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