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Commitments and Contingencies - Narrative (Details)
1 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
lawsuit
Commitments and Contingencies Disclosure [Abstract]          
Number of pending lawsuits | lawsuit         3
Number of class action claims pending | lawsuit         2
Number of representative claims pending | lawsuit         1
Rent expense   $ 7,833,000 $ 5,811,000 $ 4,147,000  
Debt Instrument [Line Items]          
Amount outstanding under Warehouse Agreement   2,016,000 0    
Borrowings from warehouse credit facilities   10,746,000 0 $ 0  
Mortgage Warehouse Facility          
Debt Instrument [Line Items]          
Amount outstanding under Warehouse Agreement   833,000      
Texas Capital Bank, Warehouse Agreement | Mortgage Warehouse Facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 10,000        
Discount on variable interest rate 1.50%        
Stated interest rate 3.00%        
Lender participation interest 97.00%        
Western Alliance Bank | Mortgage Warehouse Facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 10,000        
Stated interest rate 3.75%        
Lender participation interest 98.00%        
Borrowings from warehouse credit facilities   $ 1,184,000      
Western Alliance Bank | Mortgage Warehouse Facility | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable interest rate 3.00%        
Minimum          
Debt Instrument [Line Items]          
Operating lease term   1 year      
Maximum          
Debt Instrument [Line Items]          
Operating lease term   11 years      
Third-party Licensed Sales Class Actions          
Debt Instrument [Line Items]          
Accrual for amount of settlement payment   $ 1,800,000 $ 1,800,000