Quarterly report [Sections 13 or 15(d)]

Repurchase Agreements - Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets (Details)

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Repurchase Agreements - Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Assets Sold under Agreements to Repurchase [Line Items]    
Total $ 10,683,352 $ 8,701,825
Repurchase agreements 9,740,830 7,805,057
Available-for-sale securities, at fair value    
Assets Sold under Agreements to Repurchase [Line Items]    
Total 8,575,773 7,097,561
Mortgage servicing rights, at fair value    
Assets Sold under Agreements to Repurchase [Line Items]    
Total 1,337,875 1,355,639
Repurchase agreements 770,000 755,000
Mortgage servicing rights, at fair value | Variable Funding Note    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements 770,000 755,000
Restricted cash    
Assets Sold under Agreements to Repurchase [Line Items]    
Total 58,137 218,363
Due from counterparties    
Assets Sold under Agreements to Repurchase [Line Items]    
Total 691,270 25,231
Derivative assets, at fair value    
Assets Sold under Agreements to Repurchase [Line Items]    
Total $ 20,297 $ 5,031