Mortgage-Backed Securities - Significant Credit Quality Indicators (Details) $ in Thousands	Jun. 30, 2026 USD ($)	Dec. 31, 2025 USD ($)
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 5,972,690	$ 4,197,297
Non-Agency RMBS - Senior
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	399,771	406,175
Non-Agency RMBS - Senior \| Credit Quality Indicator, Updated Quarterly
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 194,542	$ 152,299
Non-Agency RMBS - Senior \| Credit Quality Indicator, Updated Quarterly \| Weighted Average \| Weighted Average
Debt Securities, Available-for-sale [Line Items]
Significant Inputs	0.063	0.069
Non-Agency RMBS - Senior \| Credit Quality Indicator, Updated Quarterly \| Weighted Average \| CDR
Debt Securities, Available-for-sale [Line Items]
Significant Inputs	0.011	0.014
Non-Agency RMBS - Senior \| Credit Quality Indicator, Updated Quarterly \| Weighted Average \| Loss Severity
Debt Securities, Available-for-sale [Line Items]
Significant Inputs	0.291	0.298
Non-Agency RMBS - Subordinated
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 179,343	$ 223,954
Non-Agency RMBS - Subordinated \| Credit Quality Indicator, Updated Quarterly
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,251	$ 20,688
Non-Agency RMBS - Subordinated \| Credit Quality Indicator, Updated Quarterly \| Weighted Average \| Weighted Average
Debt Securities, Available-for-sale [Line Items]
Significant Inputs	0.060	0.063
Non-Agency RMBS - Subordinated \| Credit Quality Indicator, Updated Quarterly \| Weighted Average \| CDR
Debt Securities, Available-for-sale [Line Items]
Significant Inputs	0.011	0.003
Non-Agency RMBS - Subordinated \| Credit Quality Indicator, Updated Quarterly \| Weighted Average \| Loss Severity
Debt Securities, Available-for-sale [Line Items]
Significant Inputs	0.311	0.484