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Fair Value Measurements - Fair Value of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Warehouse receivables | $ 1,273,259 | $ 993,058
Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities | 54,693 | 54,109
Equity securities | 46,879 | 51,399
Investments in unconsolidated subsidiaries | 55,769 |
Warehouse receivables | 1,273,259 | 993,058
Total assets at fair value | 1,430,600 | 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 | 6,531 | 6,998
Equity securities | 46,879 | 51,399
Investments in unconsolidated subsidiaries | 55,769 |
Total assets at fair value | 109,179 | 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 | 48,162 | 47,111
Warehouse receivables | 1,273,259 | 993,058
Total assets at fair value | 1,321,421 | 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 | 6,531 | 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 | 6,531 | 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 | 10,555 | 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 | 10,555 | 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 | 30,722 | 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 | 30,722 | 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 | 4,736 | 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 | 4,736 | 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 | 2,149 | 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 | $ 2,149 | $ 2,222

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- Definition Reflects the gross carrying amount of unpaid loans pertaining to a revolving line of credit used by mortgage bankers in which the mortgage banker originates and purchases mortgage loans due within one year or the normal operating cycle, if longer. + References No definition available. + Details
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