v3.26.1
Mortgage Servicing Rights - Summary of MSRs Carried at Fair Value (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Summary Of Mortgage Servicing Rights [Line Items]          
Balance at beginning of period $ 3,623,979 $ 3,770,034 $ 3,644,702 $ 3,867,394  
Servicing Asset At Fair Value Additions From Loan Sales 30,981 44,030 71,262 91,039  
Transfers to Agency of mortgage servicing rights relating to delinquent loans 2,107 170 2,402 391  
Due to changes in inputs used in valuation model [1] 18,904 22,713 64,491 (33,118)  
Other changes in fair value [2] (100,368) (97,841) (207,254) (186,600)  
Change in fair value, Total (81,464) (75,128) (142,763) (219,718)  
Balance at end of period [3] 3,575,603 $ 3,739,106 3,575,603 $ 3,739,106  
Pledged Assets [Member]          
Summary Of Mortgage Servicing Rights [Line Items]          
Fair value of mortgage servicing rights pledged to secure Assets sold under agreements to repurchase and Notes payable secured by credit risk transfer and mortgage servicing assets $ 3,503,566   $ 3,503,566   $ 3,582,211
[1] Primarily reflects changes in prepayment speed, OAS, or pricing spread, servicing cost, and UPB of underlying loan inputs.
[2] Represents changes due to realization of expected cash flows.
[3] During June 2026, the Company entered into an agreement to sell a portfolio of conventional MSRs with an aggregate UPB of approximately $13.0 billion. The transaction is expected to close in August 2026.