Short-Term Debt - Principal only stripped MBS (Details) $ in Thousands	Sep. 30, 2025 USD ($)
Bank of America, N.A. \| Principal-only stripped MBS
Mortgage loans sold under agreement to repurchase
Amount at risk	$ 2,520
JP Morgan Chase Bank, N.A \| Principal-only stripped MBS
Mortgage loans sold under agreement to repurchase
Amount at risk	19,591
Wells Fargo Bank, N.A. \| Principal-only stripped MBS
Mortgage loans sold under agreement to repurchase
Amount at risk	16,630
Santander US Capital Markets LLC \| Principal-only stripped MBS
Mortgage loans sold under agreement to repurchase
Amount at risk	13,954
Loan Repo Facility \| Bank of America, N.A.
Mortgage loans sold under agreement to repurchase
Amount at risk	88,716
Loan Repo Facility \| Wells Fargo Bank, N.A.
Mortgage loans sold under agreement to repurchase
Amount at risk	$ 20,975

The amount at risk under repurchase agreements is defined as the excess of carrying amount (or market value, if higher than the carrying amount or if there is no carrying amount) of the securities or other assets sold under agreement to repurchase, including accrued interest plus any cash or other assets on deposit to secure the repurchase obligation, over the amount of the repurchase liability (adjusted for accrued interest).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481420/860-30-50-9

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(m)(1)(iii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Name:	us-gaap_RepurchaseAgreementCounterpartyAmountAtRisk
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant