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Fair Value - Carrying Value and Estimated Fair Value (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financial assets:        
Loans and investments, net - Principal/Notional Amount $ 14,456,123 $ 12,158,995    
Loans and investments, net 14,254,674 11,981,048 $ 5,285,868 $ 4,189,960
Loans held-for-sale, net - Principal/Notional Amount 368,066 1,077,239    
Loans held-for-sale, net 368,066 1,077,239    
Securities, held-to-maturity, net - Principal/Notional Amount 234,255 210,728    
Securities held-to-maturity, net 156,547 140,484    
Derivative financial instruments - Principal/Notional Amount 111,950 $ 280,654    
Derivative Asset, Statement of Financial Position [Extensible Enumeration]   Other Assets.    
Financial liabilities:        
Credit and repurchase facilities, Principal/Notional Amount 3,856,009 $ 4,493,699    
Credit and repurchase facilities 3,841,814 4,481,579    
Securitized debt 7,849,270 5,892,810    
Senior unsecured notes 1,385,994 1,280,545    
Convertible senior unsecured notes, net 280,356 259,385    
Junior subordinated notes 143,128 142,382    
Derivative financial instruments - Principal/Notional Amount $ 273,973 $ 301,816    
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Other Liabilities.    
Minimum        
Financial liabilities:        
Period of loans held for sale sold 60 days      
Maximum        
Financial liabilities:        
Period of loans held for sale sold 180 days      
Carrying Value        
Financial assets:        
Loans and investments, net $ 14,254,674 $ 11,981,048    
Loans held-for-sale, net 354,070 1,093,609    
Capitalized mortgage servicing rights, net 401,471 422,734    
Securities held-to-maturity, net 156,547 140,484    
Derivative financial instruments 1,505 1,665    
Financial liabilities:        
Credit and repurchase facilities 3,841,814 4,481,579    
Securitized debt 7,849,270 5,892,810    
Senior unsecured notes 1,385,994 1,280,545    
Convertible senior unsecured notes, net 280,356 259,385    
Junior subordinated notes 143,128 142,382    
Derivative financial instruments 4,897 1,482    
Estimated Fair Value        
Financial assets:        
Loans and investments, net 14,468,418 12,181,194    
Loans held-for-sale, net 362,054 1,117,085    
Capitalized mortgage servicing rights, net 530,913 477,323    
Securities held-to-maturity, net 144,571 149,911    
Derivative financial instruments 1,505 1,665    
Financial liabilities:        
Credit and repurchase facilities 3,828,192 4,484,107    
Securitized debt 7,560,541 5,914,453    
Senior unsecured notes 1,262,560 1,301,708    
Convertible senior unsecured notes, net 287,834 294,690    
Junior subordinated notes 103,977 101,698    
Derivative financial instruments 4,897 1,482    
Securitized debt        
Financial liabilities:        
Debt face value issued to third parties 7,886,066 5,924,705    
Senior Unsecured Notes        
Financial liabilities:        
Debt face value issued to third parties 1,399,600 1,295,750    
Convertible Senior Unsecured Notes        
Financial liabilities:        
Debt face value issued to third parties 287,500 264,000    
Junior subordinated notes        
Financial liabilities:        
Debt face value issued to third parties 154,336 154,336    
Junior subordinated notes $ 143,100 $ 142,400