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Summary Of Significant Accounting Policies (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Loan impairment threshold period |  |  | 90 days |  |
Threshold of reporting unit goodwill carrying value for further analysis |  |  | $ 0 |  |
Goodwill impairment charges | $ 0 |  |  |  |
Incremental payments due upon termination of contract |  |  | 0 |  |
Right-of-use assets |  |  | 725,800,000 |  |
Lease liabilities |  |  | 707,039,000 |  |
Other operating expenses |  |  | 325,444,000 | $ 315,152,000 | $ 297,634,000
ASU 2017-08 [Member] |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Cumulative adjustments for accounting changes |  | $ 4,400,000 |  |  |
ASU 2016-02 [Member] |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Cumulative adjustments for accounting changes |  | 6,700,000 |  |  |
Right-of-use assets |  | $ 670,000,000 |  |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] |  | us-gaap:PropertyPlantAndEquipmentNet |  |  |
Lease liabilities |  | $ 670,000,000 |  |  |
Operating Lease, Liability, Statement of Financial Position [Extensible List] |  | us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent |  |  |
ASU 2018-02 [Member] |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Reclassification adjustment related to cash flow hedges and investment portfolio credit risk |  |  | 3,100,000 |  |
ASU 2016-18 [Member] |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Increase in net cash provided by operating activities |  |  |  |  | $ 17,600,000
ASU 2014-09 [Member] |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Cumulative adjustments for accounting changes |  |  | 4,200,000 |  |
Capital raising and advisory fee revenues |  |  | 33,800,000 |  |
Other operating expenses |  |  | 33,800,000 |  |
Minimum [Member] | ASU 2016-13 [Member] |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Reserve for credit losses |  |  | 107,500,000 |  |
Maximum [Member] | ASU 2016-13 [Member] |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Reserve for credit losses |  |  | $ 120,500,000 |  |
Office Equipment [Member] | Minimum [Member] |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Fixed assets, Useful life |  |  | 2 years |  |
Office Equipment [Member] | Maximum [Member] |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Fixed assets, Useful life |  |  | 7 years |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Fixed assets, Useful life |  |  | 3 years |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Fixed assets, Useful life |  |  | 39 years |  |
Aircraft Engines Held for Operating Lease [Member] |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Fixed assets, Useful life |  |  | 30 years |  |
Fixed assets, residual value percentage |  |  | 15.00% |  |

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