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Valuation (Schedule of Significant Unobservable Inputs, Qualitative Information) (Details) - Level 3
 9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2020
Dec. 31, 2020
USD ($)
$ / shares
Non-Agency RMBS      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 106,600,000   $ 127,838,000
Fair Value of Level 3 Assets, Negative Yield $ 2,100,000   $ 300,000
Non-Agency RMBS | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair Value Inputs, Yield Including Negative 5.70%   7.30%
Non-Agency RMBS | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0   0.007
Non-Agency RMBS | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.379   0.526
Non-Agency RMBS | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.064   0.074
Non-Agency RMBS | Measurement Input, Prepayment Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0   0
Non-Agency RMBS | Measurement Input, Prepayment Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.731   0.991
Non-Agency RMBS | Measurement Input, Prepayment Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.455   0.453
Non-Agency RMBS | Measurement Input, Default Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.001   0.004
Non-Agency RMBS | Measurement Input, Default Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.808   0.726
Non-Agency RMBS | Measurement Input, Default Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.104   0.184
Non-Agency RMBS | Measurement Input, Projected Collateral Recoveries | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0   0
Non-Agency RMBS | Measurement Input, Projected Collateral Recoveries | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.584   0.791
Non-Agency RMBS | Measurement Input, Projected Collateral Recoveries | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.177   0.168
CMBS      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 12,148,000   $ 63,148,000
CMBS | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.079   0.037
CMBS | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.263   0.263
CMBS | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.106   0.087
CMBS | Measurement Input, Default Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.004   0.007
CMBS | Measurement Input, Default Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.083   0.107
CMBS | Measurement Input, Default Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.028   0.036
CMBS | Measurement Input, Projected Collateral Recoveries | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.106   0.724
CMBS | Measurement Input, Projected Collateral Recoveries | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.957   0.961
CMBS | Measurement Input, Projected Collateral Recoveries | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.942   0.906
CLOs      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 30,121,000   $ 111,100,000
CLOs | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.074   0.034
CLOs | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 1.000   0.354
CLOs | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.283   0.105
CLOs | Measurement Input, Prepayment Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.541   0.412
CLOs | Measurement Input, Prepayment Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.945   0.977
CLOs | Measurement Input, Prepayment Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.896   0.657
CLOs | Measurement Input, Default Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.028   0.017
CLOs | Measurement Input, Default Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.378   0.289
CLOs | Measurement Input, Default Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.057   0.112
CLOs | Measurement Input, Projected Collateral Recoveries | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.025   0.006
CLOs | Measurement Input, Projected Collateral Recoveries | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.081   0.152
CLOs | Measurement Input, Projected Collateral Recoveries | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.038   0.079
Agency RMBS | Interest only securities      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 11,732,000   $ 11,663,000
Agency RMBS | Interest only securities | Measurement Input, Prepayment Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.093   0.083
Agency RMBS | Interest only securities | Measurement Input, Prepayment Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 1.000   1.000
Agency RMBS | Interest only securities | Measurement Input, Prepayment Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.734   0.759
Asset-backed securities, backed by consumer loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value     $ 44,925,000
Asset-backed securities, backed by consumer loans | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.127   0.126
Asset-backed securities, backed by consumer loans | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 1.214   0.275
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 0.161   0.156
Asset-backed securities, backed by consumer loans | Measurement Input, Prepayment Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.002   0.000
Asset-backed securities, backed by consumer loans | Measurement Input, Prepayment Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.120   0.116
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 0.090   0.077
Asset-backed securities, backed by consumer loans | Measurement Input, Default Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.019   0.010
Asset-backed securities, backed by consumer loans | Measurement Input, Default Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.327   0.211
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 0.206   0.171
Investment in unconsolidated entities      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 142,019,000   $ 141,620,000
Corporate loan [Member]      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value 16,561,000    
Corporate loan [Member] | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input     0.211
Corporate loan [Member] | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input     0.211
Corporate loan [Member] | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input     0.211
Total return swaps | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input     0.220
Derivative Liability, Measurement Input     0.168
Total return swaps | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input     0.220
Derivative Liability, Measurement Input     0.168
Total return swaps | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input     0.220
Derivative Liability, Measurement Input     0.168
Valuation, Market Approach | Non-Agency RMBS      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 69,090,000   $ 70,619,000
Valuation, Market Approach | Non-Agency RMBS | Measurement Input, Quoted Price | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 0.91   9.53
Valuation, Market Approach | Non-Agency RMBS | Measurement Input, Quoted Price | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 112.85   204.61
Valuation, Market Approach | Non-Agency RMBS | Measurement Input, Quoted Price | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 77.36   85.70
Valuation, Market Approach | CMBS      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 11,879,000   $ 53,199,000
Valuation, Market Approach | CMBS | Measurement Input, Quoted Price | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 7.00   4.79
Valuation, Market Approach | CMBS | Measurement Input, Quoted Price | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 71.92   98.00
Valuation, Market Approach | CMBS | Measurement Input, Quoted Price | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 53.09   65.20
Valuation, Market Approach | CLOs      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 24,199,000   $ 102,910,000
Valuation, Market Approach | CLOs | Measurement Input, Quoted Price | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 15.00   2.00
Valuation, Market Approach | CLOs | Measurement Input, Quoted Price | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 97.80   330.00
Valuation, Market Approach | CLOs | Measurement Input, Quoted Price | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 55.74   88.66
Valuation, Market Approach | Agency RMBS | Interest only securities      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 6,267,000   $ 4,844,000
Valuation, Market Approach | Agency RMBS | Interest only securities | Measurement Input, Quoted Price | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 0.55   1.91
Valuation, Market Approach | Agency RMBS | Interest only securities | Measurement Input, Quoted Price | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 23.24   18.91
Valuation, Market Approach | Agency RMBS | Interest only securities | Measurement Input, Quoted Price | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 7.20   8.38
Valuation, Market Approach | Asset-backed securities, backed by consumer loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value     $ 97,000
Valuation, Market Approach | Asset-backed securities, backed by consumer loans | Measurement Input, Quoted Price | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares     96.51
Valuation, Market Approach | Asset-backed securities, backed by consumer loans | Measurement Input, Quoted Price | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares     98.43
Valuation, Market Approach | Asset-backed securities, backed by consumer loans | Measurement Input, Quoted Price | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares     97.33
Valuation, Market Approach | Corporate loan [Member]      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 7,000,000   $ 5,855,000
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   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   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   100.00
Valuation, Market Approach | Other secured borrowings, at fair value      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ (872,306,000)   $ (754,921,000)
Valuation, Market Approach | Other secured borrowings, at fair value | Measurement Input, Quoted Price | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Debt instrument, measurement input 97.84   85.37
Valuation, Market Approach | Other secured borrowings, at fair value | Measurement Input, Quoted Price | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Debt instrument, measurement input 103.25   105.61
Valuation, Market Approach | Other secured borrowings, at fair value | Measurement Input, Quoted Price | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Debt instrument, measurement input 100.97   102.04
Valuation, Market Approach | Other secured borrowings, at fair value | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Debt instrument, measurement input 0.020   0.016
Valuation, Market Approach | Other secured borrowings, at fair value | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Debt instrument, measurement input 0.032   0.030
Valuation, Market Approach | Other secured borrowings, at fair value | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Debt instrument, measurement input 0.024   0.026
Valuation, Market Approach | Other secured borrowings, at fair value | Measurement Input, Prepayment Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Debt instrument, measurement input 0   0
Valuation, Market Approach | Other secured borrowings, at fair value | Measurement Input, Prepayment Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Debt instrument, measurement input 0.978   0.753
Valuation, Market Approach | Other secured borrowings, at fair value | Measurement Input, Prepayment Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Debt instrument, measurement input 0.672   0.487
Valuation, Income Approach | Non-Agency RMBS      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 37,510,000   $ 57,219,000
Valuation, Income Approach | CMBS      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value 269,000   9,949,000
Valuation, Income Approach | CLOs      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value 5,922,000   8,190,000
Valuation, Income Approach | Agency RMBS | Interest only securities      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value 5,465,000   6,819,000
Fair Value of Agency IOs, negative OAS measurement input $ 3,100,000   $ 4,500,000
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 0.0016   0.0297
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 1.4334   0.2886
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 0.1154   0.0914
Valuation, Income Approach | Agency RMBS | Interest only securities | Net LIBOR OAS [Member] | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.081   0.0396
Valuation, Income Approach | Asset-backed securities, backed by consumer loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 71,295,000   $ 44,828,000
Valuation, Income Approach | Corporate debt and equity      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 12,413,000   $ 5,672,000
Valuation, Income Approach | Corporate debt and equity | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.078   0.081
Valuation, Income Approach | Corporate debt and equity | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.244   0.108
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 0.106   0.097
Valuation, Income Approach | Consumer loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 55,676,000   $ 47,525,000
Valuation, Income Approach | Consumer loans | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.066   0.078
Valuation, Income Approach | Consumer loans | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.658   0.281
Valuation, Income Approach | Consumer loans | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.093   0.112
Valuation, Income Approach | Consumer loans | Measurement Input, Prepayment Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.002   0.000
Valuation, Income Approach | Consumer loans | Measurement Input, Prepayment Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.307   0.360
Valuation, Income Approach | Consumer loans | Measurement Input, Prepayment Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.143   0.173
Valuation, Income Approach | Consumer loans | Measurement Input, Default Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.011   0.009
Valuation, Income Approach | Consumer loans | Measurement Input, Default Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.808   0.866
Valuation, Income Approach | Consumer loans | Measurement Input, Default Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.094   0.094
Valuation, Income Approach | Corporate loan [Member]      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 9,561,000    
Valuation, Income Approach | Corporate loan [Member] | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.030    
Valuation, Income Approach | Corporate loan [Member] | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.293    
Valuation, Income Approach | Corporate loan [Member] | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.213    
Valuation, Income Approach | Credit default swaps on asset-backed securities      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 303,000   $ 347,000
Valuation, Income Approach | Credit default swaps on asset-backed securities | Measurement Input, Prepayment Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.299   0.327
Valuation, Income Approach | Credit default swaps on asset-backed securities | Measurement Input, Prepayment Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.410   0.397
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]      
Derivative asset, measurement input 0.385   0.381
Valuation, Income Approach | Credit default swaps on asset-backed securities | Measurement Input, Default Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.050   0.066
Valuation, Income Approach | Credit default swaps on asset-backed securities | Measurement Input, Default Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.087   0.108
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]      
Derivative asset, measurement input 0.064   0.089
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]      
Derivative asset, measurement input 0.113   0.139
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]      
Derivative asset, measurement input 0.168   0.181
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]      
Derivative asset, measurement input 0.126   0.156
Valuation, Income Approach | Total return swaps      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value     $ 9,000
Fair value     (484,000)
Enterprise Value | Investment in unconsolidated entities | Measurement Input, Equity Price-to-Book      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 92,838,000   79,536,000
Enterprise Value | Investment in unconsolidated entities | Measurement Input, Net Asset Value      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 38,613,000   $ 62,084,000
measurement input equity multiple | 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 1.1   1.0
measurement input equity multiple | 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 1.3   6.2
measurement input equity multiple | 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 1.2   1.4
Performing and/or Re-performing | Residential mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value     $ 353,924,000
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 0.003   0.025
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 0.864   0.285
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 0.043   0.054
Performing and/or Re-performing | Residential mortgage loans | Measurement Input, Offered Price | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input     60.00
Performing and/or Re-performing | Residential mortgage loans | Measurement Input, Offered Price | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input     103.88
Performing and/or Re-performing | Residential mortgage loans | Measurement Input, Offered Price | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input     103.44
Performing and/or Re-performing | Valuation, Market Approach | Residential mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value     $ 15,659,000
Performing and/or Re-performing | Valuation, Income Approach | Commercial mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 227,568,000   $ 181,545,000
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 0.062   0.037
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 0.106   0.097
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 0.080   0.081
Performing and/or Re-performing | Valuation, Income Approach | Residential mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 716,144,000   $ 338,265,000
Securitized loans [Member] | Residential mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value 917,275,000   801,343,000
Securitized loans [Member] | Valuation, Market Approach | Residential mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 885,442,000   $ 783,162,000
Securitized loans [Member] | Valuation, Market Approach | Residential mortgage loans | Measurement Input, Quoted Price | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.64   5.34
Securitized loans [Member] | Valuation, Market Approach | Residential mortgage loans | Measurement Input, Quoted Price | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 103.25   105.61
Securitized loans [Member] | Valuation, Market Approach | Residential mortgage loans | Measurement Input, Quoted Price | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 100.52   100.22
Securitized loans [Member] | Valuation, Income Approach | Residential mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 31,833,000   $ 18,182,000
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 0.008   0
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 0.074   0.387
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 0.040   0.044
Non-performing | Residential mortgage loans | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.008   0.012
Non-performing | Residential mortgage loans | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.351   0.410
Non-performing | Residential mortgage loans | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.126   0.121
Non-performing | Residential mortgage loans | Measurement Input recovery amount | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input, Recovery Amount $ 0.010   $ 0.009
Non-performing | Residential mortgage loans | Measurement Input recovery amount | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input, Recovery Amount 1.627   17.130
Non-performing | Residential mortgage loans | Measurement Input recovery amount | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input, Recovery Amount 0.362   0.306
Non-performing | Valuation, Income Approach | Commercial mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 40,023,000   $ 31,486,000
Non-performing | Valuation, Income Approach | Commercial mortgage loans | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Investment, measurement input, recovery time 6 days 1 month 24 days  
Non-performing | Valuation, Income Approach | Commercial mortgage loans | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Investment, measurement input, recovery time 6 days 5 months 24 days  
Non-performing | Valuation, Income Approach | Commercial mortgage loans | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Investment, measurement input, recovery time 6 days 3 months 21 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 0.040   0.086
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 0.181   0.146
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 0.074   0.108
Non-performing | Valuation, Income Approach | Commercial mortgage loans | Measurement Input recovery amount | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input, Recovery Amount $ 0.970   $ 1.000
Non-performing | Valuation, Income Approach | Commercial mortgage loans | Measurement Input recovery amount | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input, Recovery Amount 1.000   1.024
Non-performing | Valuation, Income Approach | Commercial mortgage loans | Measurement Input recovery amount | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input, Recovery Amount 1.000   1.008
Non-performing | Valuation, Income Approach | Residential mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 23,282,000   31,802,000
Non-performing | Valuation, Income Approach | Residential mortgage loans | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Investment, measurement input, recovery time 15 days 0 months  
Non-performing | Valuation, Income Approach | Residential mortgage loans | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Investment, measurement input, recovery time 73 months 106 months 18 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 32 months 15 days 30 months  
Non-performing securitized residential mortgage loans [Member] | Valuation, Income Approach | Residential mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 8,800,000   $ 26,400,000