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Business Combinations - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Nov. 30, 2014
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2016
Sep. 30, 2015
Dec. 01, 2014
Business Acquisition [Line Items]                
Compensation expense - RML acquisition payments   $ 3,250,000   $ 780,000   $ 4,067,000 $ 2,869,000  
Residential Mortgage Holding Company                
Business Acquisition [Line Items]                
Voting interests acquired               76.50%
Ownership prior to acquisition of company 23.50%              
Fair value of equity interest in acquiree $ 9,000,000              
Gain on purchase of mortgage affiliate         $ 3,000,000      
Liability for future earn-out payments     $ 6,600,000         $ 7,300,000
Compensation expense - RML acquisition payments   $ 3,300,000   $ 780,000   4,100,000 $ 2,900,000  
Amount of first payment made to sellers     $ 4,900,000          
Residential Mortgage Holding Company | Accounting for Payments Made to Former Equity Owners | Restatement Adjustment                
Business Acquisition [Line Items]                
Compensation expense - RML acquisition payments           $ 2,800,000    
Residential Mortgage Holding Company | First tier earn-out payment                
Business Acquisition [Line Items]                
Percent of revenue used to calculate liability           40.00%    
Residential Mortgage Holding Company | First tier earn-out payment | Minimum                
Business Acquisition [Line Items]                
Revenue range used to calculate liability           $ 1,000,000    
Residential Mortgage Holding Company | First tier earn-out payment | Maximum                
Business Acquisition [Line Items]                
Revenue range used to calculate liability           $ 2,000,000    
Residential Mortgage Holding Company | Second tier earn-out payment                
Business Acquisition [Line Items]                
Percent of revenue used to calculate liability           50.00%    
Residential Mortgage Holding Company | Second tier earn-out payment | Minimum                
Business Acquisition [Line Items]                
Revenue range used to calculate liability           $ 2,000,000    
Residential Mortgage Holding Company | Second tier earn-out payment | Maximum                
Business Acquisition [Line Items]                
Revenue range used to calculate liability           $ 3,000,000    
Residential Mortgage Holding Company | Third tier earn-out payment                
Business Acquisition [Line Items]                
Percent of revenue used to calculate liability           70.00%    
Residential Mortgage Holding Company | Third tier earn-out payment | Minimum                
Business Acquisition [Line Items]                
Revenue range used to calculate liability           $ 3,000,000    
Residential Mortgage Holding Company | Third tier earn-out payment | Maximum                
Business Acquisition [Line Items]                
Revenue range used to calculate liability           $ 4,000,000    
Residential Mortgage Holding Company | Fourth tier earn- out payment                
Business Acquisition [Line Items]                
Percent of revenue used to calculate liability           85.00%    
Residential Mortgage Holding Company | Fourth tier earn- out payment | Minimum                
Business Acquisition [Line Items]                
Revenue range used to calculate liability           $ 4,000,000    
Residential Mortgage Holding Company | Fourth tier earn- out payment | Maximum                
Business Acquisition [Line Items]                
Revenue range used to calculate liability           $ 6,000,000    
Residential Mortgage Holding Company | Fifth tier earn-out payment                
Business Acquisition [Line Items]                
Percent of revenue used to calculate liability           55.00%    
Residential Mortgage Holding Company | Fifth tier earn-out payment | Minimum                
Business Acquisition [Line Items]                
Revenue range used to calculate liability           $ 6,000,000