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Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Impact of Adoption Reflected in the Consolidated Balance Sheet) (Details) - USD ($) $ in Thousands | Jan. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019
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Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Allowance for loan and lease losses |  | $ 450,177 | $ 191,251
Reserve for unfunded lending commitments |  | $ 29,907 | 3,974
Allowance for credit losses |  |  | $ 195,225
Topic 326 [Member] |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Allowance for loan and lease losses | $ 240,662 |  |
Reserve for unfunded lending commitments | 31,304 |  |
Allowance for credit losses | 271,966 |  |
Topic 326 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] |  |  |
Allowance for loan and lease losses | 49,411 |  |
Reserve for unfunded lending commitments | 27,330 |  |
Allowance for credit losses | 76,741 |  |
Allowance for credit loss increase | 76,741 |  |
Balance sheet reclassification | (19,767) |  |
Total pretax impact | 56,974 |  |
Income tax impact | (12,887) |  |
Decrease to retained earnings | $ 44,087 |  |

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