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Basis of Presentation and Accounting Policies (Schedule of Adoption) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | $ 603,800 | $ 588,648 | $ 281,402 | $ 281,402 | $ 265,013 | $ 257,376 | $ 250,555
Reserve for unfunded commitments |  |  | 1,375 |  |  |  |
Allowance for credit losses | 664,600 |  | 282,777 |  |  |  |
Loans, net |  |  | 36,881,048 |  |  |  |
Retained earnings | 1,084,736 |  | 1,068,327 | 1,068,327 |  |  |
Total commercial and industrial |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | 260,600 | 229,915 | 145,782 |  | 142,011 | 138,004 | 133,123
Total commercial real estate |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | 143,805 | 171,526 | 67,430 |  | 61,958 | 63,463 | 68,796
Retail |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | $ 199,395 | $ 187,207 | 68,190 |  | $ 61,044 | $ 55,909 | $ 48,636
Impact of ASC 326 Adoption |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses |  |  | 82,994 | 82,994 |  |  |
Reserve for unfunded commitments |  |  | 27,440 |  |  |  |
Allowance for credit losses |  |  | 110,434 |  |  |  |
Loans, net |  |  | (20,767) |  |  |  |
Retained earnings |  |  | (35,721) |  |  |  |
Impact of ASC 326 Adoption | Total commercial and industrial |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses |  |  | (2,310) | (2,310) |  |  |
Impact of ASC 326 Adoption | Total commercial real estate |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses |  |  | (651) | (651) |  |  |
Impact of ASC 326 Adoption | Retail |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses |  |  | 85,955 | $ 85,955 |  |  |
As Reported under ASC 326 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses |  |  | 364,396 |  |  |  |
Reserve for unfunded commitments |  |  | 28,815 |  |  |  |
Allowance for credit losses |  |  | 393,211 |  |  |  |
Loans, net |  |  | 36,860,281 |  |  |  |
Retained earnings |  |  | 1,032,606 |  |  |  |
As Reported under ASC 326 | Total commercial and industrial |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses |  |  | 143,472 |  |  |  |
As Reported under ASC 326 | Total commercial real estate |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses |  |  | 66,779 |  |  |  |
As Reported under ASC 326 | Retail |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses |  |  | $ 154,145 |  |  |  |

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