v3.25.2
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, 2025
USD ($)
UsdPerLoan
Jun. 30, 2024
USD ($)
UsdPerLoan
Jun. 30, 2025
USD ($)
UsdPerLoan
Jun. 30, 2024
USD ($)
UsdPerLoan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value, MSR recognized | $ $ 44,030 $ 40,619 $ 91,039 $ 71,868
Fair value, Unpaid principal balance of underlying loans | $ $ 2,350,978 $ 2,242,511 $ 4,945,616 $ 4,073,529
Fair value, Weighted-average annual servicing fee rate (in basis points) 0.32% 0.35% 0.32% 0.35%
Minimum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value inputs, Prepayment speed during period 9.40% 10.80% 9.40% 10.80%
Fair Value inputs, Pricing spread during period 5.20% 5.90% 5.20% 5.50%
Fair Value inputs, Weighted average equivalent average life during period 3 years 9 months 18 days 3 years 4 months 24 days 3 years 8 months 12 days 3 years 4 months 24 days
Fair Value inputs, Annual per loan cost of servicing during period 69 69 68 69
Maximum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value inputs, Prepayment speed during period 15.50% 17.80% 15.50% 17.80%
Fair Value inputs, Pricing spread during period 7.30% 8.10% 7.30% 8.50%
Fair Value inputs, Weighted average equivalent average life during period 8 years 2 months 12 days 7 years 2 months 12 days 8 years 2 months 12 days 7 years 2 months 12 days
Fair Value inputs, Annual per loan cost of servicing during period 87 87 87 87
Weighted Average [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value inputs, Prepayment speed during period 9.60% 11.50% 9.70% 12.40%
Fair Value inputs, Pricing spread during period 5.30% 6.00% 5.40% 5.80%
Fair Value inputs, Weighted average equivalent average life during period 8 years 1 month 6 days 7 years 1 month 6 days 8 years 6 years 9 months 18 days
Fair Value inputs, Annual per loan cost of servicing during period 69 69 69 70