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Fair Value Measurements - Fair Value of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in unconsolidated subsidiaries $ 973,635 $ 918,226
Warehouse receivables 455,354 1,303,717
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities 61,705 71,328
Equity securities 33,724 69,880
Investments in unconsolidated subsidiaries 620,633 660,331
Warehouse receivables 455,354 1,303,717
Other assets 14,452  
Total assets at fair value 1,185,868 2,105,256
Other liabilities   10,700
Total liabilities at fair value   10,700
Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities 6,164 7,002
Equity securities 33,724 69,880
Investments in unconsolidated subsidiaries 160,093 229,900
Warehouse receivables 0 0
Other assets 0  
Total assets at fair value 199,981 306,782
Other 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 55,541 64,326
Equity securities 0 0
Investments in unconsolidated subsidiaries 0 23,741
Warehouse receivables 455,354 1,303,717
Other assets 0  
Total assets at fair value 510,895 1,391,784
Other liabilities   0
Total liabilities at fair value   0
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 460,540 406,690
Warehouse receivables 0 0
Other assets 14,452  
Total assets at fair value 474,992 406,690
Other liabilities   10,700
Total liabilities at fair value   10,700
Recurring | U.S. treasury securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities 6,164 7,002
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 6,164 7,002
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 8,249 9,276
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 8,249 9,276
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 44,091 50,897
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 44,091 50,897
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 3,201 3,428
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 3,201 3,428
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   725
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
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   725
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