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Discontinued Operations - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 02, 2016
USD ($)
loan
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Jun. 20, 2016
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Percentage of controlling interest owned by the company in OMHHF   83.68%     83.68%    
Proceeds from sale of assets         $ 0 $ 47,562  
Dividends paid to noncontrolling interest         2,448 5,740  
Noncontrolling Interest              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Dividends paid to noncontrolling interest   $ 1,600     $ 2,400    
OMHHF              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Percentage of controlling interest owned by the company in OMHHF   83.68%     83.68%    
Non-controlling interest percent   16.32%     16.32%    
Number of loans insured by U.S. Department of Housing and Urban Development (in loans) | loan 480            
Disposal group, including discontinued operation, consideration     $ 3,800     $ 3,800 $ 45,000
Disposal group, including discontinued operation, consideration withheld             $ 1,400
Gain (loss) from disposal of discontinued operation, before income tax $ 14,900            
Dividends paid to noncontrolling interest         $ 2,448    
Business Pipeline of Mortgage Loans              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from sale of assets     $ 1,400 $ 1,500