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Derivative Instruments, Outstanding Notional Amounts and Interest Rate Swap Agreements of Derivative Instruments (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2025 | Dec. 31, 2024
Pay SOFR [Member] |  |  |
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract] |  |  |
Total notional amount |  | $ 712,700 | $ 907,800
Weighted average years to maturity |  | 3 years 6 months | 3 years 7 months 6 days
Fixed interest rate |  | 1.40% | 1.10%
Receive SOFR [Member] |  |  |
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract] |  |  |
Total notional amount |  | $ 116,000 | $ 264,000
Weighted average years to maturity |  | 2 years 9 months 18 days | 1 year 7 months 6 days
Fixed interest rate |  | 3.40% | 4.50%
Notional Amount of Interest Rate Swaps [Member] |  |  |
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract] |  |  |
Total notional amount | [1] | $ 828,700 | $ 1,171,750
Fair value |  | $ 13,676 | $ 13,375
Weighted average pay rate |  | 1.82% | 1.84%
Weighted average receive rate |  | 4.27% | 4.64%
Weighted average years to maturity |  | 3 years 4 months 24 days | 3 years 1 month 6 days
Notional Amount of TBAs, Net [Member] |  |  |
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract] |  |  |
Total notional amount |  | $ 415,775 | $ 435,575
Fair value |  | (409,939) | (399,316)
Notional Amount of U.S. Treasury Futures [Member] |  |  |
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract] |  |  |
Fair value |  | (1,673) | 2,337
Not Designated as Hedging Instrument [Member] |  |  |
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract] |  |  |
Total notional amount |  | 435,425 | 809,275
Not Designated as Hedging Instrument [Member] | Notional Amount of Interest Rate Swaps [Member] |  |  |
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract] |  |  |
Total notional amount |  | 828,700 | 1,171,750
Not Designated as Hedging Instrument [Member] | Notional Amount of TBAs, Net [Member] |  |  |
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract] |  |  |
Total notional amount |  | 415,775 | 435,575
Not Designated as Hedging Instrument [Member] | Notional Amount of U.S. Treasury Futures [Member] |  |  |
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract] |  |  |
Total notional amount |  | $ 22,500 | $ 73,100
[1] | Includes $712.7 million notional of receive SOFR and pay fixed of 1.4% and $116.0 million notional of receive fixed of 3.4% and pay SOFR with weighted average maturities of 3.5 years and 2.8 years, respectively, as of September 30, 2025. Includes $907.8 million notional of receive SOFR and pay fixed of 1.1% and $264.0 million notional of receive fixed of 4.5% and pay SOFR with weighted average maturities of 3.6 years and 1.6 years, respectively, as of December 31, 2024.

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- Definition Derivative weighted average nominal pay rate used to calculate amount of money paid per unit time of derivative instrument. + References No definition available. + Details
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- Definition Derivative weighted average nominal receive rate used to calculate amount of money received per unit time of derivative instrument. + References No definition available. + Details
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- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 + Details
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