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Valuation (Schedule of Significant Unobservable Inputs, Qualitative Information) (Details) - Level 3
 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
Corporate equity securities | Non-exchange traded preferred equity investment in loan origination entity    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value   $ 3,000,000
Valuation, Market Approach | Non-Agency RMBS    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 29,780,000 $ 36,945,000
Valuation, Market Approach | Non-Agency RMBS | Measurement Input, Quoted Price | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   17.42
Securities, measurement input | $ / shares 13.58  
Valuation, Market Approach | Non-Agency RMBS | Measurement Input, Quoted Price | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   178.00
Securities, measurement input | $ / shares 164.58  
Valuation, Market Approach | Non-Agency RMBS | Measurement Input, Quoted Price | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   78.31
Securities, measurement input | $ / shares 77.94  
Valuation, Market Approach | CMBS    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 11,240,000 $ 576,000
Valuation, Market Approach | CMBS | Measurement Input, Quoted Price | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   5.93
Securities, measurement input | $ / shares 5.75  
Valuation, Market Approach | CMBS | Measurement Input, Quoted Price | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   6.36
Securities, measurement input | $ / shares 82.38  
Valuation, Market Approach | CMBS | Measurement Input, Quoted Price | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   6.14
Securities, measurement input | $ / shares 66.76  
Valuation, Market Approach | Agency RMBS | Interest only securities    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 3,257,000 $ 744,000
Valuation, Market Approach | Agency RMBS | Interest only securities | Measurement Input, Quoted Price | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   1.70
Securities, measurement input | $ / shares 3.03  
Valuation, Market Approach | Agency RMBS | Interest only securities | Measurement Input, Quoted Price | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   9.12
Securities, measurement input | $ / shares 19.27  
Valuation, Market Approach | Agency RMBS | Interest only securities | Measurement Input, Quoted Price | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   5.64
Securities, measurement input | $ / shares 9.47  
Valuation, Market Approach | Corporate debt and equity    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 2,670,000  
Valuation, Market Approach | Corporate debt and equity | Measurement Input, Quoted Price | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input | $ / shares 97.25  
Valuation, Market Approach | Corporate debt and equity | Measurement Input, Quoted Price | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input | $ / shares 100.50  
Valuation, Market Approach | Corporate debt and equity | Measurement Input, Quoted Price | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input | $ / shares 98.65  
Valuation, Market Approach | Investment in unconsolidated entities    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 3,000,000  
Valuation, Market Approach | CLOs    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 24,894,000 $ 5,828,000
Valuation, Market Approach | CLOs | Measurement Input, Quoted Price | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   2.64
Securities, measurement input | $ / shares 29.86  
Valuation, Market Approach | CLOs | Measurement Input, Quoted Price | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   375.00
Securities, measurement input | $ / shares 298.56  
Valuation, Market Approach | CLOs | Measurement Input, Quoted Price | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   167.78
Securities, measurement input | $ / shares 72.29  
Valuation, Market Approach | Corporate debt, non-exchange traded corporate equity, and secured notes [Member]    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value   $ 13,976,000
Valuation, Market Approach | Corporate debt, non-exchange traded corporate equity, and secured notes [Member] | Measurement Input, Quoted Price | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   9.69
Valuation, Market Approach | Corporate debt, non-exchange traded corporate equity, and secured notes [Member] | Measurement Input, Quoted Price | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   91.00
Valuation, Market Approach | Corporate debt, non-exchange traded corporate equity, and secured notes [Member] | Measurement Input, Quoted Price | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   59.18
Valuation, Market Approach | Corporate loan [Member]    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 5,790,000  
Valuation, Market Approach | Corporate loan [Member] | Measurement Input, Quoted Price | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input | $ / shares 100.00  
Valuation, Market Approach | Corporate loan [Member] | Measurement Input, Quoted Price | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input | $ / shares 100.00  
Valuation, Market Approach | Corporate loan [Member] | Measurement Input, Quoted Price | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input | $ / shares 100.00  
Valuation, Market Approach | Total return swaps    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 235,000  
Fair value $ (214,000)  
Valuation, Market Approach | Total return swaps | Measurement Input, Quoted Price | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Derivative asset, measurement input 53.50  
Derivative Liability, Measurement Input 53.50  
Valuation, Market Approach | Total return swaps | Measurement Input, Quoted Price | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Derivative asset, measurement input 95.00  
Derivative Liability, Measurement Input 54.50  
Valuation, Market Approach | Total return swaps | Measurement Input, Quoted Price | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Derivative asset, measurement input 88.56  
Derivative Liability, Measurement Input 54.00  
Valuation, Income Approach | Non-Agency RMBS    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 51,702,000 $ 54,346,000
Valuation, Income Approach | Non-Agency RMBS | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Total outstanding collateral 100.00% 100.00%
Valuation, Income Approach | Non-Agency RMBS | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   3.50%
Securities, measurement input 0.035  
Valuation, Income Approach | Non-Agency RMBS | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   66.10%
Securities, measurement input 0.578  
Valuation, Income Approach | Non-Agency RMBS | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   10.70%
Securities, measurement input 0.138  
Valuation, Income Approach | Non-Agency RMBS | Measurement Input, Prepayment Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   16.00%
Securities, measurement input 0.297  
Valuation, Income Approach | Non-Agency RMBS | Measurement Input, Prepayment Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   92.10%
Securities, measurement input 0.720  
Valuation, Income Approach | Non-Agency RMBS | Measurement Input, Prepayment Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   50.40%
Securities, measurement input 0.585  
Valuation, Income Approach | Non-Agency RMBS | Measurement Input, Default Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   0.00%
Securities, measurement input 0.002  
Valuation, Income Approach | Non-Agency RMBS | Measurement Input, Default Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   23.10%
Securities, measurement input 0.117  
Valuation, Income Approach | Non-Agency RMBS | Measurement Input, Default Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   8.70%
Securities, measurement input 0.048  
Valuation, Income Approach | Non-Agency RMBS | Measurement Input, Projected Collateral Recoveries | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   1.50%
Securities, measurement input 0.000  
Valuation, Income Approach | Non-Agency RMBS | Measurement Input, Projected Collateral Recoveries | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   14.60%
Securities, measurement input 0.224  
Valuation, Income Approach | Non-Agency RMBS | Measurement Input, Projected Collateral Recoveries | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   7.30%
Securities, measurement input 0.076  
Valuation, Income Approach | Non-Agency RMBS | Measurement input, Projected Collateral Scheduled Amortization | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   6.10%
Securities, measurement input 0.163  
Valuation, Income Approach | Non-Agency RMBS | Measurement input, Projected Collateral Scheduled Amortization | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   61.80%
Securities, measurement input 0.522  
Valuation, Income Approach | Non-Agency RMBS | Measurement input, Projected Collateral Scheduled Amortization | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   33.60%
Securities, measurement input 0.291  
Valuation, Income Approach | CMBS    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 1,128,000 $ 227,000
Valuation, Income Approach | CMBS | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Total outstanding collateral 100.00% 100.00%
Valuation, Income Approach | CMBS | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   3.40%
Securities, measurement input 0.250  
Valuation, Income Approach | CMBS | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   3.40%
Securities, measurement input 0.250  
Valuation, Income Approach | CMBS | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   3.40%
Securities, measurement input 0.250  
Valuation, Income Approach | CMBS | Measurement Input, Default Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   2.00%
Securities, measurement input 0.010  
Valuation, Income Approach | CMBS | Measurement Input, Default Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   2.00%
Securities, measurement input 0.010  
Valuation, Income Approach | CMBS | Measurement Input, Default Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   2.00%
Securities, measurement input 0.010  
Valuation, Income Approach | CMBS | Measurement Input, Projected Collateral Recoveries | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   6.60%
Securities, measurement input 0.031  
Valuation, Income Approach | CMBS | Measurement Input, Projected Collateral Recoveries | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   6.60%
Securities, measurement input 0.031  
Valuation, Income Approach | CMBS | Measurement Input, Projected Collateral Recoveries | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   6.60%
Securities, measurement input 0.031  
Valuation, Income Approach | CMBS | Measurement input, Projected Collateral Scheduled Amortization | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   91.40%
Securities, measurement input 0.959  
Valuation, Income Approach | CMBS | Measurement input, Projected Collateral Scheduled Amortization | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   91.40%
Securities, measurement input 0.959  
Valuation, Income Approach | CMBS | Measurement input, Projected Collateral Scheduled Amortization | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   91.40%
Securities, measurement input 0.959  
Valuation, Income Approach | Agency RMBS | Interest only securities    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 20,242,000 $ 6,549,000
Valuation, Income Approach | Agency RMBS | Interest only securities | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   2.11%
Valuation, Income Approach | Agency RMBS | Interest only securities | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   35.21%
Valuation, Income Approach | Agency RMBS | Interest only securities | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   6.77%
Total outstanding collateral 100.00% 100.00%
Valuation, Income Approach | Agency RMBS | Interest only securities | Measurement Input, LIBOR OAS | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.0093  
Valuation, Income Approach | Agency RMBS | Interest only securities | Measurement Input, LIBOR OAS | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.3527  
Valuation, Income Approach | Agency RMBS | Interest only securities | Measurement Input, LIBOR OAS | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.0953  
Valuation, Income Approach | Agency RMBS | Interest only securities | Measurement Input, Prepayment Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   37.70%
Securities, measurement input 0.133  
Valuation, Income Approach | Agency RMBS | Interest only securities | Measurement Input, Prepayment Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   100.00%
Securities, measurement input 1.000  
Valuation, Income Approach | Agency RMBS | Interest only securities | Measurement Input, Prepayment Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   66.20%
Securities, measurement input 0.804  
Valuation, Income Approach | Agency RMBS | Interest only securities | Measurement input, Projected Collateral Scheduled Amortization | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   0.00%
Securities, measurement input 0.000  
Valuation, Income Approach | Agency RMBS | Interest only securities | Measurement input, Projected Collateral Scheduled Amortization | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   62.30%
Securities, measurement input 0.867  
Valuation, Income Approach | Agency RMBS | Interest only securities | Measurement input, Projected Collateral Scheduled Amortization | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   33.80%
Securities, measurement input 0.196  
Valuation, Income Approach | Corporate Debt and non-exchange traded corporate equity [Member]    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value   $ 4,793,000
Valuation, Income Approach | Corporate Debt and non-exchange traded corporate equity [Member] | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   17.50%
Valuation, Income Approach | Corporate Debt and non-exchange traded corporate equity [Member] | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   17.50%
Valuation, Income Approach | Corporate Debt and non-exchange traded corporate equity [Member] | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   17.50%
Valuation, Income Approach | Corporate debt and equity    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 2,790,000  
Valuation, Income Approach | Corporate debt and equity | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.100  
Valuation, Income Approach | Corporate debt and equity | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.100  
Valuation, Income Approach | Corporate debt and equity | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.100  
Valuation, Income Approach | Investment in unconsolidated entities    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 32,720,000  
Valuation, Income Approach | Investment in unconsolidated entities | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Equity method investment, measurement input 0.046  
Valuation, Income Approach | Investment in unconsolidated entities | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Equity method investment, measurement input 0.156  
Valuation, Income Approach | Investment in unconsolidated entities | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Equity method investment, measurement input 0.097  
Valuation, Income Approach | CLOs    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 3,114,000 $ 9,087,000
Valuation, Income Approach | CLOs | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Total outstanding collateral 100.00% 100.00%
Valuation, Income Approach | CLOs | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   12.60%
Securities, measurement input 0.157  
Valuation, Income Approach | CLOs | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   103.10%
Securities, measurement input 0.240  
Valuation, Income Approach | CLOs | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   26.70%
Securities, measurement input 0.196  
Valuation, Income Approach | CLOs | Measurement Input, Prepayment Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   8.10%
Securities, measurement input 0.782  
Valuation, Income Approach | CLOs | Measurement Input, Prepayment Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   88.40%
Securities, measurement input 0.830  
Valuation, Income Approach | CLOs | Measurement Input, Prepayment Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   65.20%
Securities, measurement input 0.805  
Valuation, Income Approach | CLOs | Measurement Input, Default Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   3.70%
Securities, measurement input 0.104  
Valuation, Income Approach | CLOs | Measurement Input, Default Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   40.80%
Securities, measurement input 0.156  
Valuation, Income Approach | CLOs | Measurement Input, Default Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   13.50%
Securities, measurement input 0.140  
Valuation, Income Approach | CLOs | Measurement Input, Projected Collateral Recoveries | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   4.20%
Securities, measurement input 0.045  
Valuation, Income Approach | CLOs | Measurement Input, Projected Collateral Recoveries | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   38.00%
Securities, measurement input 0.062  
Valuation, Income Approach | CLOs | Measurement Input, Projected Collateral Recoveries | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   11.90%
Securities, measurement input 0.055  
Valuation, Income Approach | CLOs | Measurement input, Projected Collateral Scheduled Amortization | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   3.50%
Valuation, Income Approach | CLOs | Measurement input, Projected Collateral Scheduled Amortization | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   13.50%
Valuation, Income Approach | CLOs | Measurement input, Projected Collateral Scheduled Amortization | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   9.40%
Valuation, Income Approach | Consumer loans and asset-backed securities backed by consumer loans    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value   $ 206,761,000
Valuation, Income Approach | Consumer loans and asset-backed securities backed by consumer loans | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Total outstanding collateral   100.00%
Valuation, Income Approach | Consumer loans and asset-backed securities backed by consumer loans | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   7.00%
Valuation, Income Approach | Consumer loans and asset-backed securities backed by consumer loans | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   18.30%
Valuation, Income Approach | Consumer loans and asset-backed securities backed by consumer loans | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   8.50%
Valuation, Income Approach | Consumer loans and asset-backed securities backed by consumer loans | Measurement Input, Prepayment Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   0.00%
Valuation, Income Approach | Consumer loans and asset-backed securities backed by consumer loans | Measurement Input, Prepayment Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   45.90%
Valuation, Income Approach | Consumer loans and asset-backed securities backed by consumer loans | Measurement Input, Prepayment Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   33.50%
Valuation, Income Approach | Consumer loans and asset-backed securities backed by consumer loans | Measurement Input, Default Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   2.60%
Valuation, Income Approach | Consumer loans and asset-backed securities backed by consumer loans | Measurement Input, Default Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   84.80%
Valuation, Income Approach | Consumer loans and asset-backed securities backed by consumer loans | Measurement Input, Default Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   9.10%
Valuation, Income Approach | Consumer loans and asset-backed securities backed by consumer loans | Measurement input, Projected Collateral Scheduled Amortization | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   15.20%
Valuation, Income Approach | Consumer loans and asset-backed securities backed by consumer loans | Measurement input, Projected Collateral Scheduled Amortization | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   96.60%
Valuation, Income Approach | Consumer loans and asset-backed securities backed by consumer loans | Measurement input, Projected Collateral Scheduled Amortization | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   57.40%
Valuation, Income Approach | Asset-backed securities, backed by consumer loans    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 39,316,000  
Valuation, Income Approach | Asset-backed securities, backed by consumer loans | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Total outstanding collateral 100.00%  
Valuation, Income Approach | Asset-backed securities, backed by consumer loans | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.120  
Valuation, Income Approach | Asset-backed securities, backed by consumer loans | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.245  
Valuation, Income Approach | Asset-backed securities, backed by consumer loans | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.122  
Valuation, Income Approach | Asset-backed securities, backed by consumer loans | Measurement Input, Prepayment Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.000  
Valuation, Income Approach | Asset-backed securities, backed by consumer loans | Measurement Input, Prepayment Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.114  
Valuation, Income Approach | Asset-backed securities, backed by consumer loans | Measurement Input, Prepayment Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.095  
Valuation, Income Approach | Asset-backed securities, backed by consumer loans | Measurement Input, Default Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.009  
Valuation, Income Approach | Asset-backed securities, backed by consumer loans | Measurement Input, Default Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.480  
Valuation, Income Approach | Asset-backed securities, backed by consumer loans | Measurement Input, Default Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.142  
Valuation, Income Approach | Asset-backed securities, backed by consumer loans | Measurement input, Projected Collateral Scheduled Amortization | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.520  
Valuation, Income Approach | Asset-backed securities, backed by consumer loans | Measurement input, Projected Collateral Scheduled Amortization | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.987  
Valuation, Income Approach | Asset-backed securities, backed by consumer loans | Measurement input, Projected Collateral Scheduled Amortization | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.763  
Valuation, Income Approach | Consumer loans    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 151,699,000  
Valuation, Income Approach | Consumer loans | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Total outstanding collateral 100.00%  
Valuation, Income Approach | Consumer loans | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.070  
Valuation, Income Approach | Consumer loans | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.100  
Valuation, Income Approach | Consumer loans | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.081  
Valuation, Income Approach | Consumer loans | Measurement Input, Prepayment Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.000  
Valuation, Income Approach | Consumer loans | Measurement Input, Prepayment Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.439  
Valuation, Income Approach | Consumer loans | Measurement Input, Prepayment Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.153  
Valuation, Income Approach | Consumer loans | Measurement Input, Default Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.033  
Valuation, Income Approach | Consumer loans | Measurement Input, Default Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.864  
Valuation, Income Approach | Consumer loans | Measurement Input, Default Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.082  
Valuation, Income Approach | Consumer loans | Measurement input, Projected Collateral Scheduled Amortization | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.136  
Valuation, Income Approach | Consumer loans | Measurement input, Projected Collateral Scheduled Amortization | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.872  
Valuation, Income Approach | Consumer loans | Measurement input, Projected Collateral Scheduled Amortization | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.765  
Valuation, Income Approach | Corporate loan [Member]    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 10,000,000  
Valuation, Income Approach | Corporate loan [Member] | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.150  
Valuation, Income Approach | Corporate loan [Member] | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.180  
Valuation, Income Approach | Corporate loan [Member] | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Securities, measurement input 0.165  
Valuation, Income Approach | Performing commercial mortgage loans    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value   $ 163,876,000
Valuation, Income Approach | Performing commercial mortgage loans | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   8.00%
Valuation, Income Approach | Performing commercial mortgage loans | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   22.50%
Valuation, Income Approach | Performing commercial mortgage loans | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   9.60%
Valuation, Income Approach | Non-performing commercial mortgage loans and commercial real estate owned    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value   $ 80,513,000
Valuation, Income Approach | Non-performing commercial mortgage loans and commercial real estate owned | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, recovery time   3 months
Valuation, Income Approach | Non-performing commercial mortgage loans and commercial real estate owned | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, recovery time   16 months
Valuation, Income Approach | Non-performing commercial mortgage loans and commercial real estate owned | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, recovery time   7 months 27 days
Valuation, Income Approach | Non-performing commercial mortgage loans and commercial real estate owned | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   9.60%
Valuation, Income Approach | Non-performing commercial mortgage loans and commercial real estate owned | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   27.40%
Valuation, Income Approach | Non-performing commercial mortgage loans and commercial real estate owned | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   13.20%
Valuation, Income Approach | Performing residential mortgage loans    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value   $ 171,367,000
Valuation, Income Approach | Performing residential mortgage loans | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   2.70%
Valuation, Income Approach | Performing residential mortgage loans | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   12.90%
Valuation, Income Approach | Performing residential mortgage loans | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   6.00%
Valuation, Income Approach | Securitized residential mortgage loans    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value   $ 314,202,000
Valuation, Income Approach | Securitized residential mortgage loans | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   4.30%
Valuation, Income Approach | Securitized residential mortgage loans | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   4.60%
Valuation, Income Approach | Securitized residential mortgage loans | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   4.60%
Valuation, Income Approach | Non-performing residential mortgage loans and residential real estate owned    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value   $ 12,557,000
Valuation, Income Approach | Non-performing residential mortgage loans and residential real estate owned | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, recovery time   1 month 27 days
Valuation, Income Approach | Non-performing residential mortgage loans and residential real estate owned | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, recovery time   42 months 6 days
Valuation, Income Approach | Non-performing residential mortgage loans and residential real estate owned | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, recovery time   27 months 24 days
Valuation, Income Approach | Non-performing residential mortgage loans and residential real estate owned | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   4.30%
Valuation, Income Approach | Non-performing residential mortgage loans and residential real estate owned | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   25.10%
Valuation, Income Approach | Non-performing residential mortgage loans and residential real estate owned | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   11.30%
Valuation, Income Approach | Credit default swaps on asset-backed securities    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 1,078,000 $ 1,472,000
Valuation, Income Approach | Credit default swaps on asset-backed securities | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Total outstanding collateral 100.00% 100.00%
Valuation, Income Approach | Credit default swaps on asset-backed securities | Measurement Input, Prepayment Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   33.60%
Derivative asset, measurement input 0.337  
Valuation, Income Approach | Credit default swaps on asset-backed securities | Measurement Input, Prepayment Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   42.00%
Derivative asset, measurement input 0.402  
Valuation, Income Approach | Credit default swaps on asset-backed securities | Measurement Input, Prepayment Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   36.50%
Derivative asset, measurement input 0.355  
Valuation, Income Approach | Credit default swaps on asset-backed securities | Measurement Input, Default Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   11.10%
Derivative asset, measurement input 0.108  
Valuation, Income Approach | Credit default swaps on asset-backed securities | Measurement Input, Default Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   15.60%
Derivative asset, measurement input 0.157  
Valuation, Income Approach | Credit default swaps on asset-backed securities | Measurement Input, Default Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   12.80%
Derivative asset, measurement input 0.118  
Valuation, Income Approach | Credit default swaps on asset-backed securities | Measurement Input, Projected Collateral Recoveries | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   10.30%
Derivative asset, measurement input 0.152  
Valuation, Income Approach | Credit default swaps on asset-backed securities | Measurement Input, Projected Collateral Recoveries | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   18.70%
Derivative asset, measurement input 0.199  
Valuation, Income Approach | Credit default swaps on asset-backed securities | Measurement Input, Projected Collateral Recoveries | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   15.80%
Derivative asset, measurement input 0.185  
Valuation, Income Approach | Credit default swaps on asset-backed securities | Measurement input, Projected Collateral Scheduled Amortization | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   32.00%
Derivative asset, measurement input 0.307  
Valuation, Income Approach | Credit default swaps on asset-backed securities | Measurement input, Projected Collateral Scheduled Amortization | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   36.50%
Derivative asset, measurement input 0.356  
Valuation, Income Approach | Credit default swaps on asset-backed securities | Measurement input, Projected Collateral Scheduled Amortization | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   34.90%
Derivative asset, measurement input 0.342  
Valuation, Income Approach | Investment in unconsolidated entities    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value   $ 5,192,000
Valuation, Income Approach | Investment in unconsolidated entities | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   12.90%
Valuation, Income Approach | Investment in unconsolidated entities | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   16.10%
Valuation, Income Approach | Investment in unconsolidated entities | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, percent   15.40%
Valuation, Income Approach | Other secured borrowings, at fair value    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ (438,629,000) $ (297,948,000)
Valuation, Income Approach | Other secured borrowings, at fair value | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Debt, measurement input   3.90%
Debt instrument, measurement input 0.032  
Valuation, Income Approach | Other secured borrowings, at fair value | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Debt, measurement input   4.40%
Debt instrument, measurement input 0.100  
Valuation, Income Approach | Other secured borrowings, at fair value | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Debt, measurement input   4.30%
Debt instrument, measurement input 0.044  
Enterprise Value | Investment in unconsolidated entities    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 34,715,000  
Enterprise Value | Investment in unconsolidated entities | Measurement Input, Equity Price-to-Book | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Equity method investment, measurement input 1.0  
Enterprise Value | Investment in unconsolidated entities | Measurement Input, Equity Price-to-Book | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Equity method investment, measurement input 2.5  
Enterprise Value | Investment in unconsolidated entities | Measurement Input, Equity Price-to-Book | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Equity method investment, measurement input 1.3  
Enterprise Value | Corporate equity securities | Non-exchange traded common equity investment in mortgage-related entity    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value   $ 6,750,000
Enterprise Value | Corporate equity securities | Non-exchange traded common equity investment in mortgage-related entity | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   3.3
Enterprise Value | Corporate equity securities | Non-exchange traded common equity investment in mortgage-related entity | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   3.3
Enterprise Value | Corporate equity securities | Non-exchange traded common equity investment in mortgage-related entity | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   3.3
Enterprise Value | Corporate equity securities | Non-exchange traded preferred equity investment in mortgage-related entity    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value   $ 27,317,000
Enterprise Value | Corporate equity securities | Non-exchange traded preferred equity investment in mortgage-related entity | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   1.1
Enterprise Value | Corporate equity securities | Non-exchange traded preferred equity investment in mortgage-related entity | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   1.1
Enterprise Value | Corporate equity securities | Non-exchange traded preferred equity investment in mortgage-related entity | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input   1.1
Performing and/or Re-performing | Residential mortgage loans | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Loans, Measurement Input 0.033  
Performing and/or Re-performing | Residential mortgage loans | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Loans, Measurement Input 0.581  
Performing and/or Re-performing | Residential mortgage loans | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Loans, Measurement Input 0.056  
Performing and/or Re-performing | Valuation, Income Approach | Commercial mortgage loans    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 222,219,000  
Performing and/or Re-performing | Valuation, Income Approach | Commercial mortgage loans | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Loans, Measurement Input 0.080  
Performing and/or Re-performing | Valuation, Income Approach | Commercial mortgage loans | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Loans, Measurement Input 0.126  
Performing and/or Re-performing | Valuation, Income Approach | Commercial mortgage loans | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Loans, Measurement Input 0.089  
Performing and/or Re-performing | Valuation, Income Approach | Residential mortgage loans    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 316,804,000  
Securitized loans [Member] | Valuation, Income Approach | Residential mortgage loans    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 466,297,000  
Securitized loans [Member] | Valuation, Income Approach | Residential mortgage loans | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Loans, Measurement Input 0.036  
Securitized loans [Member] | Valuation, Income Approach | Residential mortgage loans | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Loans, Measurement Input 0.100  
Securitized loans [Member] | Valuation, Income Approach | Residential mortgage loans | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Loans, Measurement Input 0.049  
Non-performing | Residential mortgage loans | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Loans, Measurement Input 0.014  
Non-performing | Residential mortgage loans | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Loans, Measurement Input 0.376  
Non-performing | Residential mortgage loans | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Loans, Measurement Input 0.104  
Non-performing | Valuation, Income Approach | Commercial mortgage loans    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 38,407,000  
Non-performing | Valuation, Income Approach | Commercial mortgage loans | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, recovery time 1 month  
Non-performing | Valuation, Income Approach | Commercial mortgage loans | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, recovery time 5 months  
Non-performing | Valuation, Income Approach | Commercial mortgage loans | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, recovery time 2 months 16 days  
Non-performing | Valuation, Income Approach | Commercial mortgage loans | Measurement Input, Discount Rate | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Loans, Measurement Input 0.103  
Non-performing | Valuation, Income Approach | Commercial mortgage loans | Measurement Input, Discount Rate | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Loans, Measurement Input 0.162  
Non-performing | Valuation, Income Approach | Commercial mortgage loans | Measurement Input, Discount Rate | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Loans, Measurement Input 0.112  
Non-performing | Valuation, Income Approach | Residential mortgage loans    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Fair value $ 14,628,000  
Non-performing | Valuation, Income Approach | Residential mortgage loans | Minimum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, recovery time 0 days  
Non-performing | Valuation, Income Approach | Residential mortgage loans | Maximum    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, recovery time 115 months 25 days  
Non-performing | Valuation, Income Approach | Residential mortgage loans | Weighted Average    
Fair Value Measurements Inputs and Valuation Techniques [Line Items]    
Investment, measurement input, recovery time 53 months 28 days