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Fair Value Measurements - Fair Value of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warehouse receivables $ 1,211,886 $ 993,058
Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 69,772 54,109
Equity securities 40,089 51,399
Warehouse receivables 1,211,886 993,058
Total assets at fair value 1,321,747 1,098,566
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 7,325 6,998
Equity securities 40,089 51,399
Total assets at fair value 47,414 58,397
Recurring [Member] | Significant Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 62,447 47,111
Warehouse receivables 1,211,886 993,058
Total assets at fair value 1,274,333 1,040,169
Recurring [Member] | U.S. treasury securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 7,325 6,998
Recurring [Member] | U.S. treasury securities [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 7,325 6,998
Recurring [Member] | Debt securities issued by U.S. federal agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 10,944 10,639
Recurring [Member] | Debt securities issued by U.S. federal agencies [Member] | Significant Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 10,944 10,639
Recurring [Member] | Corporate debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 47,173 29,098
Recurring [Member] | Corporate debt securities [Member] | Significant Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 47,173 29,098
Recurring [Member] | Asset-backed securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 2,973 5,152
Recurring [Member] | Asset-backed securities [Member] | Significant Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 2,973 5,152
Recurring [Member] | Collateralized mortgage obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 1,357 2,222
Recurring [Member] | Collateralized mortgage obligations [Member] | Significant Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities $ 1,357 $ 2,222