v3.26.1
Fair Value - Key Assumptions Used in Determining Fair Value of MSRs at Time of Initial Recognition (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
UsdPerLoan
Jun. 30, 2025
USD ($)
UsdPerLoan
Jun. 30, 2026
USD ($)
UsdPerLoan
Jun. 30, 2025
USD ($)
UsdPerLoan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value, MSR recognized | $ $ 30,981 $ 44,030 $ 71,262 $ 91,039
Fair value, Unpaid principal balance of underlying loans | $ $ 1,890,845 $ 2,350,978 $ 4,088,510 $ 4,945,616
Fair value, Weighted-average annual servicing fee rate (in basis points) 0.29% 0.32% 0.31% 0.32%
Minimum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value inputs, Pricing spread during period 4.70% 5.20% 4.70% 5.20%
Fair Value inputs, Prepayment speed during period 8.10% 9.40% 8.10% 9.40%
Fair Value inputs, Weighted average equivalent average life during period 5 years 6 months 3 years 9 months 18 days 3 years 8 months 12 days 3 years 8 months 12 days
Fair Value inputs, Annual per loan cost of servicing during period 69 69 69 68
Maximum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value inputs, Pricing spread during period 9.70% 7.30% 10.00% 7.30%
Fair Value inputs, Prepayment speed during period 14.60% 15.50% 14.90% 15.50%
Fair Value inputs, Weighted average equivalent average life during period 9 years 8 years 2 months 12 days 9 years 8 years 2 months 12 days
Fair Value inputs, Annual per loan cost of servicing during period 122 87 122 87
Weighted Average [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value inputs, Pricing spread during period 6.90% 5.30% 6.60% 5.40%
Fair Value inputs, Prepayment speed during period 9.70% 9.60% 9.50% 9.70%
Fair Value inputs, Weighted average equivalent average life during period 8 years 1 month 6 days 8 years 1 month 6 days 8 years 1 month 6 days 8 years
Fair Value inputs, Annual per loan cost of servicing during period 78 69 75 69