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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