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Recent Accounting Pronouncements (Schedule of Impact of Adoption Reflected in Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands | Jan. 01, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
Assets and Liabilities |  |  |  |  |
Allowance for loan and lease losses | $ 240,662 | $ 448,674 | $ 191,251 | $ 195,572 | $ 194,514
Reserve for unfunded lending commitments | 31,304 | 31,526 | 3,974 |  |
Total allowance for credit losses | 271,966 | 480,200 | 195,225 |  |
Retained Earnings |  |  |  |  |
Decrease to retained earnings |  | $ 1,211,878 | $ 1,476,232 |  |
Implementation CECL [Member] |  |  |  |  |
Assets and Liabilities |  |  |  |  |
Allowance for loan and lease losses | 49,411 |  |  |  |
Reserve for unfunded lending commitments | 27,330 |  |  |  |
Total allowance for credit losses | 76,741 |  |  |  |
Retained Earnings |  |  |  |  |
Allowance for credit loss increase | 76,741 |  |  |  |
Balance sheet reclassification | 19,767 |  |  |  |
Total pretax impact | 56,974 |  |  |  |
Income tax impact | (12,888) |  |  |  |
Decrease to retained earnings | $ 44,086 |  |  |  |

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