Quarterly report [Sections 13 or 15(d)]

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

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Financing - Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Assets Sold under Agreements to Repurchase [Line Items]    
Assets pledged as collateral for repurchase agreements $ 7,707,109 $ 8,701,825
Repurchase agreements 7,104,650 7,805,057
Available-For-Sale Securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets pledged as collateral for repurchase agreements 6,193,675 7,097,561
Mortgage Servicing Rights    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets pledged as collateral for repurchase agreements 1,069,095 1,355,639
Repurchase agreements 738,000 755,000
Mortgage Servicing Rights | Variable Funding Note    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements 738,000 755,000
Mortgage Loans Held-for-Sale    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets pledged as collateral for repurchase agreements 3,675 0
Repurchase agreements 3,504 0
Restricted cash    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets pledged as collateral for repurchase agreements 18,059 218,363
Due from counterparties    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets pledged as collateral for repurchase agreements 293,663 25,231
Derivative Assets    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets pledged as collateral for repurchase agreements $ 128,942 $ 5,031