v3.26.1
Mortgage Servicing Rights - Summary of MSRs Carried at Fair Value (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Summary Of Mortgage Servicing Rights [Line Items]      
Balance at beginning of quarter $ 3,644,702 $ 3,867,394  
Servicing Asset At Fair Value Additions From Loan Sales 40,281 47,009  
Transfers to Agency of mortgage servicing rights relating to delinquent loans 295 221  
Due to changes in inputs used in valuation model [1] 45,587 (55,831)  
Other changes in fair value [2] (106,886) (88,759)  
Change in fair value, Total (61,299) (144,590)  
Balance at end of quarter 3,623,979 $ 3,770,034  
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 $ 3,560,828   $ 3,582,211
[1] Primarily reflects changes in prepayment speed, pricing spread or OAS, servicing cost, and UPB of underlying loan inputs.
[2] Represents changes due to realization of expected cash flows.