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Investment in Securities (Summary of Investment in Securities) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Securities, Available-for-sale [Line Items] |  |  |
Investment Owned, Face Amount | $ 618,220 | $ 598,454 | $ 783,043
Unamortized Discount (Premium), Net | (25,508) | (28,808) | (15,587)
Debt Securities, Available-for-Sale, Amortized Cost | 774,401 | 674,985 | 785,710
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 6,338 | 4,287 | 13,202
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (26,498) | (17,935) | (25,364)
Investment Owned At Fair Value, Net | $ 754,241 | $ 661,337 | $ 773,548
Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate | 5.86% | 5.70% | 4.49%
Weighted Average Yield | 8.55% | 6.50% | 4.92%
Investment, estimated remaining life | 7 years 1 month 20 days | 7 years 3 months 3 days | 6 years 3 months 25 days
Long |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Owned, Face Amount |  | $ 622,057 |
Unamortized Discount (Premium), Net |  | (29,449) |
Debt Securities, Available-for-Sale, Amortized Cost |  | 697,947 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  | 3,903 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (17,935) |
Investment Owned At Fair Value, Net |  | $ 683,915 |
Long | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate |  | 5.76% |
Weighted Average Yield |  | 7.29% |
Investment, estimated remaining life |  | 7 years 2 months 1 day |
Short |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Unamortized Discount (Premium), Net |  | $ 641 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  | 384 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | 0 |
Security Sold Short, Principal Amount |  | (23,603) |
Financial Instruments Sold, Not Yet Purchased, Amortized Cost |  | (22,962) |
U.S. Treasury securities sold short, at fair value |  | $ (22,578) |
Short | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate |  | 4.02% |
Weighted Average Yield |  | 4.32% |
Investment, estimated remaining life |  | 9 years 10 months 9 days |
15-year fixed rate mortgages [Member] | Long |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Current Principal |  |  | $ 28,647
Unamortized Discount (Premium), Net |  |  | 118
Debt Securities, Available-for-Sale, Amortized Cost |  |  | 28,765
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  |  | 32
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  |  | (950)
Debt Securities, Available-for-Sale |  |  | $ 27,847
15-year fixed rate mortgages [Member] | Long | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate |  |  | 3.46%
Weighted Average Yield |  |  | 3.20%
Investment, estimated remaining life |  |  | 2 years 10 months 24 days
20-year fixed rate mortgages [Member] | Long |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Current Principal |  |  | $ 8,524
Unamortized Discount (Premium), Net |  |  | 509
Debt Securities, Available-for-Sale, Amortized Cost |  |  | 9,033
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  |  | 4
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  |  | (1,174)
Debt Securities, Available-for-Sale |  |  | $ 7,863
20-year fixed rate mortgages [Member] | Long | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate |  |  | 3.30%
Weighted Average Yield |  |  | 2.21%
Investment, estimated remaining life |  |  | 5 years 8 months 4 days
30-year fixed rate mortgages [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Current Principal | $ 519,109 |  |
Unamortized Discount (Premium), Net | (16,601) |  |
Debt Securities, Available-for-Sale, Amortized Cost | 502,508 |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 5,027 |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (3,643) |  |
Debt Securities, Available-for-Sale | $ 503,892 |  |
30-year fixed rate mortgages [Member] | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate | 4.90% |  |
Weighted Average Yield | 5.34% |  |
Investment, estimated remaining life | 6 years 8 months 15 days |  |
30-year fixed rate mortgages [Member] | Long |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Current Principal |  | $ 536,948 | $ 697,510
Unamortized Discount (Premium), Net |  | (17,320) | (15,131)
Debt Securities, Available-for-Sale, Amortized Cost |  | 519,628 | 682,379
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  | 1,696 | 8,180
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (9,017) | (20,265)
Debt Securities, Available-for-Sale |  | $ 512,307 | $ 670,294
30-year fixed rate mortgages [Member] | Long | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate |  | 4.86% | 4.26%
Weighted Average Yield |  | 5.26% | 4.42%
Investment, estimated remaining life |  | 7 years 3 months 3 days | 6 years 6 months 3 days
Adjustable Rate Mortgages | Long |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Current Principal |  |  | $ 7,127
Unamortized Discount (Premium), Net |  |  | 933
Debt Securities, Available-for-Sale, Amortized Cost |  |  | 8,060
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  |  | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  |  | (941)
Debt Securities, Available-for-Sale |  |  | $ 7,119
Adjustable Rate Mortgages | Long | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate |  |  | 4.68%
Weighted Average Yield |  |  | 2.74%
Investment, estimated remaining life |  |  | 4 years 5 months 12 days
Interest-Only [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | $ 2 |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 0 |  |
Debt Securities, Available-for-Sale | $ 2 |  |
Interest-Only [Member] | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate | 1.21% |  |
Weighted Average Yield | 11.51% |  |
Investment, estimated remaining life | 2 years 9 months 25 days |  |
Interest-Only [Member] | Long |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | $ 2 | $ 6,607
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  | 0 | 971
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | 0 | (163)
Debt Securities, Available-for-Sale |  | $ 2 | $ 7,415
Interest-Only [Member] | Long | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate |  | 1.20% | 2.77%
Weighted Average Yield |  | 11.27% | 15.64%
Investment, estimated remaining life |  | 2 years 9 months 3 days | 6 years 1 month 6 days
Reverse mortgages [Member] | Long |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Current Principal |  |  | $ 14,406
Unamortized Discount (Premium), Net |  |  | 2,183
Debt Securities, Available-for-Sale, Amortized Cost |  |  | 16,589
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  |  | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  |  | (1,715)
Debt Securities, Available-for-Sale |  |  | $ 14,874
Reverse mortgages [Member] | Long | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate |  |  | 5.92%
Weighted Average Yield |  |  | 2.94%
Investment, estimated remaining life |  |  | 4 years 6 months
Non-Agency Principal and interest securities | Long |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Current Principal |  |  | $ 9,953
Unamortized Discount (Premium), Net |  |  | (1,764)
Debt Securities, Available-for-Sale, Amortized Cost |  |  | 8,189
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  |  | 1,231
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  |  | (11)
Debt Securities, Available-for-Sale |  |  | $ 9,409
Non-Agency Principal and interest securities | Long | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate |  |  | 9.39%
Weighted Average Yield |  |  | 10.72%
Investment, estimated remaining life |  |  | 5 years 9 months 18 days
Non-Agency Interest only securities | Long |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  |  | $ 8,700
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  |  | 2,610
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  |  | 0
Debt Securities, Available-for-Sale |  |  | $ 11,310
Non-Agency Interest only securities | Long | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate |  |  | 0.22%
Weighted Average Yield |  |  | 16.69%
Investment, estimated remaining life |  |  | 9 years 10 days
CLO Notes |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Current Principal | $ 97,297 |  |
Unamortized Discount (Premium), Net | (7,490) |  |
Debt Securities, Available-for-Sale, Amortized Cost | 89,807 |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 397 |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (4,756) |  |
Debt Securities, Available-for-Sale | $ 85,448 |  |
CLO Notes | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate | 11.09% |  |
Weighted Average Yield | 16.95% |  |
Investment, estimated remaining life | 3 years 7 months 24 days |  |
CLO Notes | Long |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Current Principal |  | $ 83,322 | $ 16,876
Unamortized Discount (Premium), Net |  | (10,740) | (2,435)
Debt Securities, Available-for-Sale, Amortized Cost |  | 72,582 | 14,441
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  | 1,382 | 123
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (1,972) | (73)
Debt Securities, Available-for-Sale |  | $ 71,992 | $ 14,491
CLO Notes | Long | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate |  | 11.69% | 12.16%
Weighted Average Yield |  | 15.05% | 15.26%
Investment, estimated remaining life |  | 2 years 10 months 20 days | 5 years 7 months 28 days
CLO Equity |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | $ 181,611 |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 877 |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (18,079) |  |
Debt Securities, Available-for-Sale | $ 164,409 |  |
CLO Equity | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Weighted Average Yield | 13.32% |  |
Investment, estimated remaining life | 10 years 3 months 7 days |  |
CLO Equity | Long |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | $ 105,262 | $ 2,947
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  | 795 | 51
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (6,927) | (72)
Debt Securities, Available-for-Sale |  | $ 99,130 | $ 2,926
CLO Equity | Long | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Weighted Average Yield |  | 12.12% | 35.84%
Investment, estimated remaining life |  | 9 years 10 months 9 days | 5 years 10 months 13 days
U.S. Treasury Securities | Short |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Unamortized Discount (Premium), Net |  | $ 641 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  | 384 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | 0 |
Security Sold Short, Principal Amount |  | (23,603) |
Financial Instruments Sold, Not Yet Purchased, Amortized Cost |  | (22,962) |
U.S. Treasury securities sold short, at fair value |  | $ (22,578) |
U.S. Treasury Securities | Short | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate |  | 4.02% |
Weighted Average Yield |  | 4.32% |
Investment, estimated remaining life |  | 9 years 10 months 9 days |
Equity Securities |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | $ 76 |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (20) |  |
Debt Securities, Available-for-Sale | 56 |  |
Equity Securities | Long |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | $ 75 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  | 0 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (19) |
Debt Securities, Available-for-Sale |  | 56 |
Corporate Debt Securities |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Current Principal | 1,814 |  |
Unamortized Discount (Premium), Net | (1,417) |  |
Debt Securities, Available-for-Sale, Amortized Cost | 397 |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 37 |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 0 |  |
Debt Securities, Available-for-Sale | $ 434 |  |
Corporate Debt Securities | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate | 0.00% |  |
Weighted Average Yield | 0.00% |  |
Investment, estimated remaining life | 1 year 1 month 13 days |  |
Corporate Debt Securities | Long |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Current Principal |  | 1,787 |
Unamortized Discount (Premium), Net |  | (1,389) |
Debt Securities, Available-for-Sale, Amortized Cost |  | 398 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  | 30 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | 0 |
Debt Securities, Available-for-Sale |  | $ 428 |
Corporate Debt Securities | Long | Weighted Average [Member] |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate |  | 0.00% |
Weighted Average Yield |  | 0.00% |
Investment, estimated remaining life |  | 1 year 3 months 25 days |
Interest-Only [Member] | Agency RMBS [Member] | Long |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate | 1.21% | 1.20% | 2.77%
Interest-Only [Member] | Non-Agency RMBS | Long |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate |  |  | 0.22%
Agency RMBS: | Interest-Only [Member] | Long |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Notional Amount of Nonderivative Instruments | $ 28 | $ 29 | $ 83,800
Non-Agency Principal and interest securities | Non-Agency RMBS | Long |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Investment Interest Rate |  |  | 9.39%
Non-Agency RMBS | Interest-Only [Member] | Long |  |  |
Securities, Available-for-sale [Line Items] |  |  |
Notional Amount of Nonderivative Instruments |  |  | $ 1,050,000

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