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Fair Value Measurements - Fair Value of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warehouse receivables $ 765,130 $ 993,058
Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 52,627 54,109
Equity securities 49,907 51,399
Investment in unconsolidated subsidiary 14,048  
Warehouse receivables 765,130 993,058
Total assets at fair value 881,712 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 6,719 6,998
Equity securities 49,907 51,399
Investment in unconsolidated subsidiary 14,048  
Total assets at fair value 70,674 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 45,908 47,111
Warehouse receivables 765,130 993,058
Total assets at fair value 811,038 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 6,719 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 6,719 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 9,735 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 9,735 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 30,724 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 30,724 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 3,588 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 3,588 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 1,861 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 $ 1,861 $ 2,222