Mortgage-Backed Securities - Schedule of Components of Carrying Value of MBS and GSE CRT Portfolio (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Debt Securities, Available-for-sale [Line Items] | ||
| Principal/ Notional Balance | $ 7,354,216 | $ 6,606,785 |
| Unamortized premium | 41,444 | 39,890 |
| Unamortized discount | (503,083) | (504,008) |
| Gross unrealized gains | 84,318 | 139,370 |
| Gross unrealized losses | (26,986) | (5,428) |
| Total | 6,949,909 | 6,276,609 |
| MBS | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Principal/ Notional Balance | 6,890,694 | 6,121,811 |
| Unamortized premium | 41,444 | 39,890 |
| Unamortized discount | (96,579) | (79,603) |
| Gross unrealized gains | 76,848 | 130,576 |
| Gross unrealized losses | (26,884) | (5,385) |
| Total | 6,885,523 | 6,207,289 |
| Interest-Only Securities | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Principal/ Notional Balance | 463,522 | 484,974 |
| Unamortized premium | 0 | 0 |
| Unamortized discount | (406,504) | (424,405) |
| Gross unrealized gains | 7,470 | 8,794 |
| Gross unrealized losses | (102) | (43) |
| Total | $ 64,386 | $ 69,320 |
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- Definition Debt Securities, Principal or Notional Amount No definition available.
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- Definition Debt Securities, Trading, Accumulated Unrealized Gain No definition available.
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- Definition Debt Securities, Trading, Accumulated Unrealized Loss No definition available.
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- Definition Debt Securities, Unamortized Discount No definition available.
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- Definition Debt Securities, Unamortized Premium No definition available.
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- Definition The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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/disclosureRef
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