Fair Value Measurements - Unobservable Inputs Assumptions - Non-Agency RMBS Held for Investment (Details) - Level 3	Mar. 31, 2025	Dec. 31, 2024
Discount Rate | Minimum | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.05	0.05
Discount Rate | Minimum | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0	0
Discount Rate | Minimum | Non-Agency RMBS - Interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.09	0.09
Discount Rate | Maximum | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.12	0.10
Discount Rate | Maximum | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.15	0.15
Discount Rate | Maximum | Non-Agency RMBS - Interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	1	1
Discount Rate | Weighted Average Borrowing Rates | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.063	0.066
Discount Rate | Weighted Average Borrowing Rates | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.084	0.085
Discount Rate | Weighted Average Borrowing Rates | Non-Agency RMBS - Interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.107	0.118
Prepay Rate | Minimum | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.06	0.06
Prepay Rate | Minimum | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.06	0.06
Prepay Rate | Minimum | Non-Agency RMBS - Interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.06	0.06
Prepay Rate | Maximum | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.18	0.20
Prepay Rate | Maximum | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.22	0.20
Prepay Rate | Maximum | Non-Agency RMBS - Interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.25	0.25
Prepay Rate | Weighted Average Borrowing Rates | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.066	0.066
Prepay Rate | Weighted Average Borrowing Rates | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.084	0.081
Prepay Rate | Weighted Average Borrowing Rates | Non-Agency RMBS - Interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.068	0.070
CDR | Minimum | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0	0
CDR | Minimum | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0	0
CDR | Minimum | Non-Agency RMBS - Interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0	0
CDR | Maximum | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.16	0.13
CDR | Maximum | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.03	0.03
CDR | Maximum | Non-Agency RMBS - Interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.13	0.07
CDR | Weighted Average Borrowing Rates | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.012	0.012
CDR | Weighted Average Borrowing Rates | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.007	0.007
CDR | Weighted Average Borrowing Rates | Non-Agency RMBS - Interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.009	0.009
Loss Severity | Minimum | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.25	0.25
Loss Severity | Minimum | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.25	0.25
Loss Severity | Minimum | Non-Agency RMBS - Interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0	0
Loss Severity | Maximum | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.86	0.86
Loss Severity | Maximum | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.50	0.50
Loss Severity | Maximum | Non-Agency RMBS - Interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.89	0.83
Loss Severity | Weighted Average Borrowing Rates | Non-Agency RMBS - Senior
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.305	0.300
Loss Severity | Weighted Average Borrowing Rates | Non-Agency RMBS - Subordinated
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.321	0.331
Loss Severity | Weighted Average Borrowing Rates | Non-Agency RMBS - Interest-only
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Significant Inputs	0.281	0.294