Fair Value of Financial Instruments - Schedule of Fair Values Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Assets:
Mortgage-backed securities	$ 6,949,909	$ 6,276,609
Derivative assets	2,347
Liabilities:
Derivative liabilities	882
Recurring
Assets:
Derivative assets	16,510	4,412
Total assets	6,966,419	6,281,021
Liabilities:
Derivative liabilities	882
Total liabilities	882
Recurring \| Mortgage-backed securities
Assets:
Mortgage-backed securities	6,949,909	6,276,609
Recurring \| Level 1
Assets:
Derivative assets	5,248	2,177
Total assets	5,248	2,177
Liabilities:
Derivative liabilities	0
Total liabilities	0
Recurring \| Level 1 \| Mortgage-backed securities
Assets:
Mortgage-backed securities	0	0
Recurring \| Level 2
Assets:
Derivative assets	11,262	2,235
Total assets	6,961,171	6,278,844
Liabilities:
Derivative liabilities	882
Total liabilities	882
Recurring \| Level 2 \| Mortgage-backed securities
Assets:
Mortgage-backed securities	6,949,909	6,276,609
Recurring \| Level 3
Assets:
Derivative assets	0	0
Total assets	0	0
Liabilities:
Derivative liabilities	0
Total liabilities	0
Recurring \| Level 3 \| Mortgage-backed securities
Assets:
Mortgage-backed securities	$ 0	$ 0

Fair value portion of asset recognized for present right to economic benefit.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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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.

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Fair value of financial and nonfinancial obligations.

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