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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