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Business Purpose Residential Loans - Product Types and Characteristics of Business Purpose Loans (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 1,486 2,013
Total Principal $ 1,034,434 $ 1,409,179
30-89 Days DQ 559 1,913
90 Days DQ $ 747 $ 459
Single-family rental loans, held-for-sale at fair value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 11  
Total Principal $ 27,566  
30-89 Days DQ 0  
90 Days DQ 0  
Single-family rental loans, held-for-sale at fair value | $251 to $500    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum 251  
Loan Balance, maximum $ 500  
Number of Loans | loan 2  
Total Principal $ 787  
30-89 Days DQ 0  
90 Days DQ $ 0  
Single-family rental loans, held-for-sale at fair value | $251 to $500 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 6.79%  
Single-family rental loans, held-for-sale at fair value | $251 to $500 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 7.47%  
Single-family rental loans, held-for-sale at fair value | $501 to $750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 501  
Loan Balance, maximum $ 750  
Number of Loans | loan 2  
Total Principal $ 1,252  
30-89 Days DQ 0  
90 Days DQ $ 0  
Single-family rental loans, held-for-sale at fair value | $501 to $750 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 6.12%  
Single-family rental loans, held-for-sale at fair value | $501 to $750 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 7.25%  
Single-family rental loans, held-for-sale at fair value | $751 to $1,000    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 751  
Loan Balance, maximum $ 1,000  
Number of Loans | loan 3  
Total Principal $ 2,488  
30-89 Days DQ 0  
90 Days DQ $ 0  
Single-family rental loans, held-for-sale at fair value | $751 to $1,000 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 5.91%  
Single-family rental loans, held-for-sale at fair value | $751 to $1,000 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 6.58%  
Single-family rental loans, held-for-sale at fair value | Over $1,000    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, maximum $ 1,000  
Number of Loans | loan 4  
Total Principal $ 23,039  
30-89 Days DQ 0  
90 Days DQ $ 0  
Single-family rental loans, held-for-sale at fair value | Over $1,000 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 5.62%  
Single-family rental loans, held-for-sale at fair value | Over $1,000 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 6.94%  
Residential bridge loans held-for-investment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 157  
Total Principal $ 112,360  
30-89 Days DQ 4,991  
90 Days DQ 12,134  
Residential bridge loans held-for-investment | $0 to $250    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum 0  
Loan Balance, maximum $ 250  
Number of Loans | loan 50  
Total Principal $ 7,941  
30-89 Days DQ 262  
90 Days DQ $ 695  
Residential bridge loans held-for-investment | $0 to $250 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 8.00%  
Residential bridge loans held-for-investment | $0 to $250 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 12.00%  
Residential bridge loans held-for-investment | $251 to $500    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 251  
Loan Balance, maximum $ 500  
Number of Loans | loan 38  
Total Principal $ 13,297  
30-89 Days DQ 636  
90 Days DQ $ 469  
Residential bridge loans held-for-investment | $251 to $500 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 8.00%  
Residential bridge loans held-for-investment | $251 to $500 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 10.00%  
Residential bridge loans held-for-investment | $501 to $750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 501  
Loan Balance, maximum $ 750  
Number of Loans | loan 21  
Total Principal $ 12,410  
30-89 Days DQ 1,769  
90 Days DQ $ 0  
Residential bridge loans held-for-investment | $501 to $750 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 7.50%  
Residential bridge loans held-for-investment | $501 to $750 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 10.00%  
Residential bridge loans held-for-investment | $751 to $1,000    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 751  
Loan Balance, maximum $ 1,000  
Number of Loans | loan 19  
Total Principal $ 16,937  
30-89 Days DQ 840  
90 Days DQ $ 0  
Residential bridge loans held-for-investment | $751 to $1,000 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 7.50%  
Residential bridge loans held-for-investment | $751 to $1,000 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 10.00%  
Residential bridge loans held-for-investment | Over $1,000    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, maximum $ 1,000  
Number of Loans | loan 29  
Total Principal $ 61,775  
30-89 Days DQ 1,484  
90 Days DQ $ 10,970  
Residential bridge loans held-for-investment | Over $1,000 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 8.00%  
Residential bridge loans held-for-investment | Over $1,000 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 10.00%