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Valuation (Schedule of Significant Unobservable Inputs, Qualitative Information) (Details) - Level 3
 6 Months Ended 9 Months Ended
Jun. 30, 2023
USD ($)
$ / shares
Sep. 30, 2022
Dec. 31, 2022
USD ($)
$ / shares
Non-Agency RMBS      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 168,609,000   $ 132,502,000
Fair Value of Level 3 Assets, Negative Yield     $ 200,000
Non-Agency RMBS | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair Value Inputs, Yield Including Negative     11.90%
Non-Agency RMBS | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.000   0.000
Non-Agency RMBS | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 1.047   0.957
Non-Agency RMBS | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.124   0.121
Non-Agency RMBS | Measurement Input, Prepayment Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.000   0.000
Non-Agency RMBS | Measurement Input, Prepayment Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 1.000   1.000
Non-Agency RMBS | Measurement Input, Prepayment Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.359   0.520
Non-Agency RMBS | Measurement Input, Default Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.000   0.000
Non-Agency RMBS | Measurement Input, Default Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.986   0.974
Non-Agency RMBS | Measurement Input, Default Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.144   0.165
Non-Agency RMBS | Measurement Input, Projected Collateral Recoveries | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.000   0.000
Non-Agency RMBS | Measurement Input, Projected Collateral Recoveries | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.388   0.695
Non-Agency RMBS | Measurement Input, Projected Collateral Recoveries | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.131   0.154
CMBS      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 12,308,000   $ 12,649,000
CMBS | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.115   0.094
CMBS | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.194   0.175
CMBS | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.167   0.127
CMBS | Measurement Input, Default Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0   0.012
CMBS | Measurement Input, Default Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.490   0.398
CMBS | Measurement Input, Default Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.048   0.058
CMBS | Measurement Input, Projected Collateral Recoveries | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.510   0.602
CMBS | Measurement Input, Projected Collateral Recoveries | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 1.000   0.965
CMBS | Measurement Input, Projected Collateral Recoveries | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.937   0.928
CLOs      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 19,733,000   $ 24,598,000
Fair Value of Level 3 Assets, Negative Yield     $ 600,000
CLOs | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair Value Inputs, Yield Including Negative     22.30%
CLOs | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.127   0.132
CLOs | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.657   0.361
CLOs | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.249   0.233
Agency RMBS | Interest only securities      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 5,355,000   $ 7,027,000
Agency RMBS | Interest only securities | Measurement Input, Prepayment Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.248   0.232
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 0.570   0.553
Asset-backed securities, backed by consumer loans | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.078   0.067
Asset-backed securities, backed by consumer loans | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.317   0.279
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 0.130   0.135
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   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 0.234   0.183
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 0.163   0.144
Asset-backed securities, backed by consumer loans | Measurement Input, Default Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.000   0.006
Asset-backed securities, backed by consumer loans | Measurement Input, Default Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.412   0.352
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 0.204   0.213
Investment in unconsolidated entities      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 118,420,000   $ 127,046,000
Valuation, Market Approach | Non-Agency RMBS      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 99,850,000   $ 59,831,000
Valuation, Market Approach | Non-Agency RMBS | Measurement Input, Quoted Price | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 0.47   0.45
Valuation, Market Approach | Non-Agency RMBS | Measurement Input, Quoted Price | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 147.30   159.91
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 77.49   69.79
Valuation, Market Approach | CMBS      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 12,308,000   $ 12,080,000
Valuation, Market Approach | CMBS | Measurement Input, Quoted Price | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 5.20   5.54
Valuation, Market Approach | CMBS | Measurement Input, Quoted Price | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 70.00   69.07
Valuation, Market Approach | CMBS | Measurement Input, Quoted Price | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 38.55   38.37
Valuation, Market Approach | CLOs      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 15,975,000   $ 17,925,000
Valuation, Market Approach | CLOs | Measurement Input, Quoted Price | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 30.10   3.96
Valuation, Market Approach | CLOs | Measurement Input, Quoted Price | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 95.00   92.00
Valuation, Market Approach | CLOs | Measurement Input, Quoted Price | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input | $ / shares 69.72   57.94
Valuation, Market Approach | Agency RMBS | Interest only securities      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 714,000   $ 2,358,000
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 0.30   11.83
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 20.29   20.44
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 12.70   16.54
Valuation, Market Approach | Other secured borrowings, at fair value      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ (1,472,368,000)   $ (1,539,881,000)
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 49.09   54.94
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 98.10   98.22
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 86.39   87.34
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 0.036   0.037
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 0.062   0.085
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 0.054   0.069
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 0.931   0.933
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 0.953   0.963
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 0.941   0.945
Valuation, Market Approach | Mortgage servicing rights | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Servicing Asset, Measurement Input 0.120   0.120
Valuation, Market Approach | Mortgage servicing rights | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Servicing Asset, Measurement Input 0.120   0.120
Valuation, Market Approach | Mortgage servicing rights | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Servicing Asset, Measurement Input 0.120   0.120
Valuation, Market Approach | Mortgage servicing rights | Measurement Input, Prepayment Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Servicing Asset, Measurement Input 0.110   0.110
Valuation, Market Approach | Mortgage servicing rights | Measurement Input, Prepayment Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Servicing Asset, Measurement Input 0.371   0.371
Valuation, Market Approach | Mortgage servicing rights | Measurement Input, Prepayment Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Servicing Asset, Measurement Input 0.140   0.147
Valuation, Market Approach | Servicing-related asset | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Servicing Asset, Measurement Input 0.117   0.117
Valuation, Market Approach | Servicing-related asset | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Servicing Asset, Measurement Input 0.117   0.117
Valuation, Market Approach | Servicing-related asset | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Servicing Asset, Measurement Input 0.117   0.117
Valuation, Market Approach | Loan commitments | Measurement Input pullthrough rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Servicing Asset, Measurement Input 0.606   0.562
Valuation, Market Approach | Loan commitments | Measurement Input pullthrough rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Servicing Asset, Measurement Input 1.000   1.000
Valuation, Market Approach | Loan commitments | Measurement Input pullthrough rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Servicing Asset, Measurement Input 0.750   0.737
Valuation, Market Approach | Loan commitments | measurement input cost to originate loan | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Servicing Asset, Measurement Input 0.030   0.024
Valuation, Market Approach | Loan commitments | measurement input cost to originate loan | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Servicing Asset, Measurement Input 0.078   0.071
Valuation, Market Approach | Loan commitments | measurement input cost to originate loan | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Servicing Asset, Measurement Input 0.055   0.044
Valuation, Market Approach | HMBS-related obligations      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ (8,055,288,000)   $ (7,787,155,000)
Valuation, Market Approach | HMBS-related obligations | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Debt instrument, measurement input 0.023   0.041
Valuation, Market Approach | HMBS-related obligations | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Debt instrument, measurement input 0.070   0.061
Valuation, Market Approach | HMBS-related obligations | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Debt instrument, measurement input 0.047   0.051
Valuation, Market Approach | HMBS-related obligations | Measurement Input, Prepayment Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Debt instrument, measurement input 0.080   0.073
Valuation, Market Approach | HMBS-related obligations | Measurement Input, Prepayment Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Debt instrument, measurement input 0.453   0.367
Valuation, Market Approach | HMBS-related obligations | Measurement Input, Prepayment Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Debt instrument, measurement input 0.092   0.098
Valuation, Market Approach | Senior Notes      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ (185,325,000)   $ (191,835,000)
Valuation, Market Approach | Senior Notes | Measurement Input, Quoted Price | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Debt instrument, measurement input 88.25   91.35
Valuation, Market Approach | Senior Notes | Measurement Input, Quoted Price | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Debt instrument, measurement input 88.25   91.35
Valuation, Market Approach | Senior Notes | Measurement Input, Quoted Price | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Debt instrument, measurement input 88.25   91.35
Valuation, Income Approach | Non-Agency RMBS      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 68,759,000   $ 72,671,000
Valuation, Income Approach | CMBS      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value 0   569,000
Valuation, Income Approach | CLOs      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value 3,758,000   6,673,000
Valuation, Income Approach | Agency RMBS | Interest only securities      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value 4,641,000   4,669,000
Fair Value of Agency IOs, negative OAS measurement input $ 500,000   $ 600,000
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 0.0037   0.0057
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 0.4232   0.4217
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 0.0641   0.0554
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 0.0437   0.0437
Valuation, Income Approach | Asset-backed securities, backed by consumer loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 77,139,000   $ 73,644,000
Valuation, Income Approach | Corporate debt and equity      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 20,369,000   $ 18,644,000
Valuation, Income Approach | Corporate debt and equity | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.074   0.000
Valuation, Income Approach | Corporate debt and equity | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Securities, measurement input 0.399   0.496
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 0.145   0.164
Valuation, Income Approach | Consumer loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 3,059,000   $ 4,843,000
Valuation, Income Approach | Consumer loans | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.104   0.106
Valuation, Income Approach | Consumer loans | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.279   0.282
Valuation, Income Approach | Consumer loans | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.178   0.176
Valuation, Income Approach | Consumer loans | Measurement Input, Prepayment Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.000   0.001
Valuation, Income Approach | Consumer loans | Measurement Input, Prepayment Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.171   0.217
Valuation, Income Approach | Consumer loans | Measurement Input, Prepayment Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.075   0.122
Valuation, Income Approach | Consumer loans | Measurement Input, Default Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.000   0.004
Valuation, Income Approach | Consumer loans | Measurement Input, Default Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.447   0.612
Valuation, Income Approach | Consumer loans | Measurement Input, Default Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.145   0.132
Valuation, Income Approach | Corporate loan [Member]      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 6,532,000   $ 4,086,000
Valuation, Income Approach | Corporate loan [Member] | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.060   0.060
Valuation, Income Approach | Corporate loan [Member] | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.343   0.130
Valuation, Income Approach | Corporate loan [Member] | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.137   0.071
Valuation, Income Approach | Credit default swaps on asset-backed securities      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 76,000   $ 76,000
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 0.229   0.229
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 0.229   0.229
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 0.229   0.229
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 0.086   0.086
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 0.086   0.086
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 0.086   0.086
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 0.123   0.123
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 0.123   0.123
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 0.123   0.123
Valuation, Income Approach | HECM loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 8,262,333,000   $ 7,993,635,000
Valuation, Income Approach | HECM loans | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.025   0.042
Valuation, Income Approach | HECM loans | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.071   0.063
Valuation, Income Approach | HECM loans | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.048   0.052
Valuation, Income Approach | HECM loans | Measurement Input, Prepayment Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.079   0.018
Valuation, Income Approach | HECM loans | Measurement Input, Prepayment Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.453   0.446
Valuation, Income Approach | HECM loans | Measurement Input, Prepayment Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.093   0.098
Valuation, Income Approach | Proprietary reverse mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 185,052,000   $ 103,602,000
Valuation, Income Approach | Proprietary reverse mortgage loans | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.059   0.065
Valuation, Income Approach | Proprietary reverse mortgage loans | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.092   0.086
Valuation, Income Approach | Proprietary reverse mortgage loans | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.075   0.081
Valuation, Income Approach | Proprietary reverse mortgage loans | Measurement Input, Prepayment Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.110   0.110
Valuation, Income Approach | Proprietary reverse mortgage loans | Measurement Input, Prepayment Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.371   0.371
Valuation, Income Approach | Proprietary reverse mortgage loans | Measurement Input, Prepayment Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.147   0.138
Valuation, Income Approach | Mortgage servicing rights      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 7,473,000   $ 8,108,000
Valuation, Income Approach | Servicing-related asset      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value 1,304,000   999,000
Valuation, Income Approach | Loan commitments      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value 3,800,000   3,060,000
Enterprise Value | Investment in unconsolidated entities | Measurement Input, Equity Price-to-Book      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value 32,518,000   37,099,000
Value of investments excluded from range calculation 6,500,000   7,300,000
Enterprise Value | Investment in unconsolidated entities | Measurement Input, Net Asset Value      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 85,360,000   $ 88,905,000
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 0.9   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   1.8
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 1.0   1.1
Valuation, Cost Approach | Investment in unconsolidated entities | Measurement Input, Exercise Price      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 542,000   $ 1,042,000
Valuation, Cost Approach | HECM loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 23,676,000    
Including amounts excluded from range calculation | 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 6.7   3.2
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 0.007   0.005
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 0.909   0.535
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 0.087   0.087
Performing and/or Re-performing | Valuation, Income Approach | Commercial mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 327,465,000   $ 17,583,000
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   0.230
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 0.135   0.251
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 0.112   0.248
Performing and/or Re-performing | Valuation, Income Approach | Residential mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 1,336,039,000   $ 1,416,951,000
Securitized loans [Member] | Residential mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value 1,592,985,000   1,665,070,000
Securitized loans [Member] | Valuation, Market Approach | Residential mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 1,479,434,000   $ 1,539,170,000
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 0.81   0.54
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 98.10   98.22
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 85.15   86.45
Securitized loans [Member] | Valuation, Income Approach | Residential mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 113,551,000   $ 125,900,000
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 0.039   0.044
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 0.440   0.408
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 0.079   0.083
Non-performing | Residential mortgage loans | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.002   0.037
Non-performing | Residential mortgage loans | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.833   0.796
Non-performing | Residential mortgage loans | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input 0.091   0.137
Non-performing | Residential mortgage loans | Measurement Input recovery amount | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input, Recovery Amount $ 0.020   $ 0.015
Non-performing | Residential mortgage loans | Measurement Input recovery amount | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input, Recovery Amount 2.278   2.206
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 1.030   $ 0.214
Non-performing | Valuation, Income Approach | Commercial mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 20,895,000    
Non-performing | Valuation, Income Approach | Commercial mortgage loans | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Investment, measurement input, recovery time 2 months 27 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 3 months 27 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 3 months 18 days 2 months 9 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 0.157   1.000
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 0.506   1.005
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 0.248   1.004
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 $ 1.005   $ 1.8
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 1.250   5.8
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 1.070   2.3
Non-performing | Valuation, Income Approach | Residential mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 64,659,000   33,497,000
Non-performing | Valuation, Income Approach | Residential mortgage loans | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Investment, measurement input, recovery time 17 months 6 days 3 months  
Non-performing | Valuation, Income Approach | Residential mortgage loans | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Investment, measurement input, recovery time 83 months 21 days 105 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 33 months 24 days 16 months 24 days  
Non-performing securitized residential mortgage loans [Member] | Valuation, Income Approach | Residential mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value $ 14,200,000   $ 9,000,000
Performing commercial mortgage loans | Residential mortgage loans | Measurement Input, Discount Rate | Minimum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input     0.052
Performing commercial mortgage loans | Residential mortgage loans | Measurement Input, Discount Rate | Maximum      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input     0.165
Performing commercial mortgage loans | Residential mortgage loans | Measurement Input, Discount Rate | Weighted Average      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Loans, Measurement Input     0.105
Performing commercial mortgage loans | Valuation, Income Approach | Residential mortgage loans      
Fair Value Measurements Inputs and Valuation Techniques [Line Items]      
Fair value     $ 386,741,000