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Securities (Schedule of Contractual Maturities of Debt Securities Available-for-Sale) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Abstract] |  |
Debt securities, available-for-sale, due within one year, Amortized Cost | $ 86,113 |
Debt securities, available-for-sale, due after one year through five years, Amortized Cost | 961,029 |
Debt securities, available-for-sale, due after five years through ten years, Amortized Cost | 1,522,735 |
Debt securities, available-for-sale, due after ten years, Amortized Cost | 3,328,164 |
Debt Securities Available-for-Sale, Amortized Cost | 5,898,041 | $ 4,997,529
Debt securities, available-for-sale, due within one year, Fair Value | 86,855 |
Debt securities, available-for-sale, due after one year through five years, Fair Value | 977,757 |
Debt securities, available-for-sale, due after five years through ten years, Fair Value | 1,538,002 |
Debt securities, available-for-sale, due after ten years, Fair Value | 3,308,385 |
Debt Securities Available-for-Sale, Fair Value | 5,910,999 | 5,210,134
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One | 0 |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five | 46,085 |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year Five through Ten | 1,256,426 |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 | 845,816 |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Total | 2,148,327 | 0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value | 0 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 45,307 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 1,240,587 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 836,712 |
Debt Securities, Held-to-maturity, Fair Value, Total | $ 2,122,606 | $ 0

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