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Basis of Presentation and Accounting Policies (Schedule of Adoption) (Details) - USD ($) $ in Thousands |  | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member | us-gaap:AccountingStandardsUpdate201613Member | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | $ 281,402 | $ 588,648 | $ 257,376 | $ 493,452 | $ 281,402 | $ 257,036 | $ 250,555
Reserve for unfunded commitments | 1,375 |  |  |  |  |  |
Allowance for credit losses | 282,777 | 649,700 |  |  |  |  |
Loans, net | 36,881,048 |  |  |  |  |  |
Retained earnings | 1,068,327 | 1,050,527 |  |  | 1,068,327 |  |
Total commercial and industrial |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | 145,782 | 229,915 | 138,004 | 216,950 |  | 135,639 | 133,123
Total commercial real estate |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | 67,430 | 171,526 | 63,463 | 107,117 |  | 69,009 | 68,796
Retail |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | 68,190 | $ 187,207 | $ 55,909 | $ 169,385 |  | $ 52,388 | $ 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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