Investments - AFS Securities - Unrealized Loss Positions (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
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| Available-for-sale Securities. Unrealized Loss Position [Line Items] | ||
| Less than 12 Months, Estimated Fair Value | $ 266,884 | $ 128,855 |
| Less than 12 Months, Unrealized Losses | (518) | (316) |
| 12 Months or More, Estimated Fair Value | 591,021 | 1,287,087 |
| 12 Months or More, Unrealized Losses | (3,334) | (6,403) |
| Total Estimated Fair Value | 857,905 | 1,415,942 |
| Total Unrealized Losses | (3,852) | (6,719) |
| GSE multifamily MBS | Multifamily | ||
| Available-for-sale Securities. Unrealized Loss Position [Line Items] | ||
| Less than 12 Months, Estimated Fair Value | 266,884 | 128,855 |
| Less than 12 Months, Unrealized Losses | (518) | (316) |
| 12 Months or More, Estimated Fair Value | 591,021 | 1,287,087 |
| 12 Months or More, Unrealized Losses | (3,334) | (6,403) |
| Total Estimated Fair Value | 857,905 | 1,415,942 |
| Total Unrealized Losses | $ (3,852) | $ (6,719) |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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