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Fair Value Measurement - Schedule of Single Family Loans Held for Sale Measure Using Level 3 Unobservable Inputs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Loans held for investment carried at fair value $ 5,546   $ 5,546   $ 17,988
Loans held for sale, fair value $ 730,042   $ 730,042   656,334
Market price movement from comparable bond (as a percent) 7.10% 0.00% 100.00% 0.00%  
Fair Value, Measurements, Recurring [Member]          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Loans held for investment carried at fair value $ 5,546   $ 5,546   17,988
Loans held for sale, fair value 730,042   730,042   656,334
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Loans held for investment carried at fair value 5,546   5,546   17,988
Loans held for sale, fair value $ 91   $ 91   $ 41,810
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans Held for Investment [Member] | Minimum [Member]          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Implied spread to benchmark interest rate curve (as a percent)     3.73%   3.62%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans Held for Investment [Member] | Maximum [Member]          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Implied spread to benchmark interest rate curve (as a percent)     4.84%   4.97%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans Held for Investment [Member] | Weighted Average [Member]          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Implied spread to benchmark interest rate curve (as a percent)     4.13%   4.49%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans Held for Sale [Member] | Minimum [Member]          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Implied spread to benchmark interest rate curve (as a percent)     4.36%   3.46%
Market price movement from comparable bond (as a percent)     (0.58%)   (0.49%)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans Held for Sale [Member] | Maximum [Member]          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Implied spread to benchmark interest rate curve (as a percent)     4.36%   6.14%
Market price movement from comparable bond (as a percent)     (0.14%)   (0.11%)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans Held for Sale [Member] | Weighted Average [Member]          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Implied spread to benchmark interest rate curve (as a percent)     4.36%   4.23%
Market price movement from comparable bond (as a percent)     (0.36%)   (0.27%)