Short-Term Debt - Principal only stripped MBS (Details) $ in Thousands	Mar. 31, 2024 USD ($)
Wells Fargo Bank, N.A. \| Principal-only stripped MBS
Mortgage loans sold under agreement to repurchase
Amount at risk	$ 11,838
JP Morgan Chase Bank \| Principal-only stripped MBS
Mortgage loans sold under agreement to repurchase
Amount at risk	11,546
Santander US Capital Markets LLC \| Principal-only stripped MBS
Mortgage loans sold under agreement to repurchase
Amount at risk	8,968
Loan Repo Facility \| Wells Fargo Bank, N.A.
Mortgage loans sold under agreement to repurchase
Amount at risk	$ 11,917

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 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