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Fair Value Measurements - Fair Value of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Assets    
Investments in unconsolidated subsidiaries $ 920,655 $ 973,635
Warehouse receivables 1,010,659 455,354
Recurring    
Assets    
Available for sale debt securities 69,910 61,705
Equity securities 38,561 33,724
Investments in unconsolidated subsidiaries 575,210 620,633
Warehouse receivables 1,010,659 455,354
Other assets 25,213 14,452
Total assets at fair value 1,719,553 1,185,868
Recurring | Level 1    
Assets    
Available for sale debt securities 12,152 6,164
Equity securities 38,561 33,724
Investments in unconsolidated subsidiaries 128,919 160,093
Warehouse receivables 0 0
Other assets 0 0
Total assets at fair value 179,632 199,981
Recurring | Level 2    
Assets    
Available for sale debt securities 57,758 55,541
Equity securities 0 0
Investments in unconsolidated subsidiaries 0 0
Warehouse receivables 1,010,659 455,354
Other assets 0 0
Total assets at fair value 1,068,417 510,895
Recurring | Level 3    
Assets    
Available for sale debt securities 0 0
Equity securities 0 0
Investments in unconsolidated subsidiaries 446,291 460,540
Warehouse receivables 0 0
Other assets 25,213 14,452
Total assets at fair value 471,504 474,992
Recurring | U.S. treasury securities    
Assets    
Available for sale debt securities 12,152 6,164
Recurring | U.S. treasury securities | Level 1    
Assets    
Available for sale debt securities 12,152 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 10,966 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 10,966 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 45,410 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 45,410 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 1,382 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 1,382 3,201
Recurring | Asset-backed securities | Level 3    
Assets    
Available for sale debt securities $ 0 $ 0