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Fair Value Measurements - Fair Value of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in unconsolidated subsidiaries | $ 997,300 | $ 973,600
Warehouse receivables | 675,000 | 455,000
Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 68,000 | 62,000
Equity securities | 41,000 | 34,000
Investments in unconsolidated subsidiaries | 645,000 | 621,000
Warehouse receivables | 675,000 | 455,000
Other assets | 16,000 | 14,000
Total assets at fair value | 1,445,000 | 1,186,000
Derivative liabilities | 5,000 |
Total liabilities at fair value | 5,000 | 0
Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 12,000 | 6,000
Equity securities | 41,000 | 34,000
Investments in unconsolidated subsidiaries | 168,000 | 160,000
Warehouse receivables | 0 | 0
Other assets | 0 | 0
Total assets at fair value | 221,000 | 200,000
Derivative liabilities | 0 |
Total liabilities at fair value | 0 |
Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available for sale debt securities | 56,000 | 56,000
Equity securities | 0 | 0
Investments in unconsolidated subsidiaries | 0 | 0
Warehouse receivables | 675,000 | 455,000
Other assets | 0 | 0
Total assets at fair value | 731,000 | 511,000
Derivative liabilities | 5,000 |
Total liabilities at fair value | 5,000 |
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 | 477,000 | 461,000
Warehouse receivables | 0 | 0
Other assets | 16,000 | 14,000
Total assets at fair value | 493,000 | 475,000
Derivative liabilities | 0 |
Total liabilities at fair value | 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 | 12,000 | 6,000
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 | 12,000 | 6,000
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 | 11,000 | 9,000
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 | 11,000 | 9,000
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 | 44,000 | 44,000
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 | 44,000 | 44,000
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 | 1,000 | 3,000
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 | 1,000 | 3,000
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

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