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Discontinued Operations (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 02, 2016 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2016 USD ($) | Jun. 20, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  | 83.68% |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  | 16.32% |  |  |  |
Proceeds from Divestiture of Businesses |  |  |  | $ 0 | $ 45,448 | $ 0 |  |
Dividends paid to noncontrolling interest |  |  |  | 2,448 | 5,740 | $ 0 |  |
Oppenheimer Multi Family Housing And Healthcare Finance [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of Loans Insured by U.S. Department of Housing and Development | 480 |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  |  |  | $ 3,800 | $ 45,000
Disposal Group, Including Discontinued Operations, Consideration Withheld |  |  |  |  |  |  |  | $ 1,400
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax | $ 14,900 |  |  |  |  |  |  |
Dividends paid to noncontrolling interest |  |  |  | 2,400 | 5,700 |  |  |
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries |  |  |  | 12,600 | $ 29,400 |  |  |
Payments for Repurchase of Preferred Stock and Preference Stock |  |  |  | $ 5,000 |  |  |  |
Business Pipeline of Mortgage Loans [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  | $ 1,400 | $ 1,500 |  |  |  |  |

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