Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Additional Information (Detail)

v3.21.1
Fair Value Measurements - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Ginnie Mae loans subject to repurchase right description If a borrower makes no payment for three consecutive months, the servicer has the option to repurchase the delinquent loan for an amount equal to 100% of the loan’s remaining principal balance  
Ginnie Mae    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Percent of remaining principal balance of delinquent loan repurchase option 100.00%  
Recurring Fair Value Measurements | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Average pull-through rate used to calculate fair value of IRLCs 87.80% 89.40%
Minimum | Discount Rate | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Range of risk adjusted discount rate 8.0 8.0
Maximum | Discount Rate | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Range of risk adjusted discount rate 20.0 20.0
Median | Discount Rate | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Range of risk adjusted discount rate 15.0 15.0