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Fair Value Measurements - Fair Value of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Assets    
Investments in unconsolidated subsidiaries $ 950,985 $ 973,635
Warehouse receivables 792,294 455,354
Recurring    
Assets    
Available for sale debt securities 58,485 61,705
Equity securities 33,512 33,724
Investments in unconsolidated subsidiaries 591,123 620,633
Warehouse receivables 792,294 455,354
Other assets 20,445 14,452
Total assets at fair value 1,495,859 1,185,868
Liabilities at fair value 0 0
Recurring | Level 1    
Assets    
Available for sale debt securities 6,127 6,164
Equity securities 33,512 33,724
Investments in unconsolidated subsidiaries 134,567 160,093
Warehouse receivables 0 0
Other assets 0 0
Total assets at fair value 174,206 199,981
Recurring | Level 2    
Assets    
Available for sale debt securities 52,358 55,541
Equity securities 0 0
Investments in unconsolidated subsidiaries 0 0
Warehouse receivables 792,294 455,354
Other assets 0 0
Total assets at fair value 844,652 510,895
Recurring | Level 3    
Assets    
Available for sale debt securities 0 0
Equity securities 0 0
Investments in unconsolidated subsidiaries 456,556 460,540
Warehouse receivables 0 0
Other assets 20,445 14,452
Total assets at fair value 477,001 474,992
Recurring | U.S. treasury securities    
Assets    
Available for sale debt securities 6,127 6,164
Recurring | U.S. treasury securities | Level 1    
Assets    
Available for sale debt securities 6,127 6,164
Recurring | U.S. treasury securities | Level 2    
Assets    
Available for sale debt securities 0 0
Recurring | U.S. treasury securities | Level 3    
Assets    
Available for sale debt securities 0 0
Recurring | Debt securities issued by U.S. federal agencies    
Assets    
Available for sale debt securities 7,702 8,249
Recurring | Debt securities issued by U.S. federal agencies | Level 1    
Assets    
Available for sale debt securities 0 0
Recurring | Debt securities issued by U.S. federal agencies | Level 2    
Assets    
Available for sale debt securities 7,702 8,249
Recurring | Debt securities issued by U.S. federal agencies | Level 3    
Assets    
Available for sale debt securities 0 0
Recurring | Corporate debt securities    
Assets    
Available for sale debt securities 41,704 44,091
Recurring | Corporate debt securities | Level 1    
Assets    
Available for sale debt securities 0 0
Recurring | Corporate debt securities | Level 2    
Assets    
Available for sale debt securities 41,704 44,091
Recurring | Corporate debt securities | Level 3    
Assets    
Available for sale debt securities 0 0
Recurring | Asset-backed securities    
Assets    
Available for sale debt securities 2,952 3,201
Recurring | Asset-backed securities | Level 1    
Assets    
Available for sale debt securities 0 0
Recurring | Asset-backed securities | Level 2    
Assets    
Available for sale debt securities 2,952 3,201
Recurring | Asset-backed securities | Level 3    
Assets    
Available for sale debt securities $ 0 $ 0