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Fair Value Measurements - Fair Value of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in unconsolidated subsidiaries | $ 116,314 | $ 124,262
Warehouse receivables | 1,411,170 | 993,058
Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 73,900 | 54,109
Equity securities | 43,334 | 51,399
Investments in unconsolidated subsidiaries | 50,000 |
Warehouse receivables | 1,411,170 | 993,058
Total assets at fair value | 1,578,404 | 1,098,566
Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 7,270 | 6,998
Equity securities | 43,334 | 51,399
Investments in unconsolidated subsidiaries | 0 |
Warehouse receivables | 0 | 0
Total assets at fair value | 50,604 | 58,397
Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 66,630 | 47,111
Equity securities | 0 | 0
Investments in unconsolidated subsidiaries | 0 |
Warehouse receivables | 1,411,170 | 993,058
Total assets at fair value | 1,477,800 | 1,040,169
Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 0 | 0
Equity securities | 0 | 0
Investments in unconsolidated subsidiaries | 50,000 |
Warehouse receivables | 0 | 0
Total assets at fair value | 50,000 | 0
Recurring | U.S. treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 7,270 | 6,998
Recurring | U.S. treasury securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 7,270 | 6,998
Recurring | U.S. treasury securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 0 | 0
Recurring | U.S. treasury securities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 0 | 0
Recurring | Debt securities issued by U.S. federal agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 10,216 | 10,639
Recurring | Debt securities issued by U.S. federal agencies | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 0 | 0
Recurring | Debt securities issued by U.S. federal agencies | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 10,216 | 10,639
Recurring | Debt securities issued by U.S. federal agencies | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 0 | 0
Recurring | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 51,244 | 29,098
Recurring | Corporate debt securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 0 | 0
Recurring | Corporate debt securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 51,244 | 29,098
Recurring | Corporate debt securities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 0 | 0
Recurring | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 3,801 | 5,152
Recurring | Asset-backed securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 0 | 0
Recurring | Asset-backed securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 3,801 | 5,152
Recurring | Asset-backed securities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 0 | 0
Recurring | Collateralized mortgage obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 1,369 | 2,222
Recurring | Collateralized mortgage obligations | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 0 | 0
Recurring | Collateralized mortgage obligations | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 1,369 | 2,222
Recurring | Collateralized mortgage obligations | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | $ 0 | $ 0

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