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Fair Value, Carrying Value and Estimated Fair Value (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial assets:        
Loans and investments, net - Principal/Notional Amount $ 12,158,995,000 $ 5,475,082,000    
Loans and investments, net 11,981,048,000 5,285,868,000 $ 4,189,960,000 $ 3,200,145,000
Loans held-for-sale, net - Principal/Notional Amount 1,077,239,000 968,595,000    
Loans held-for-sale, net 1,077,239,000 968,595,000    
Securities, held-to-maturity, net - Principal/Notional Amount 210,728,000 140,124,000    
Securities held-to-maturity, net 140,484,000 95,524,000    
Derivative financial instruments - Principal/Notional Amount 280,654,000 865,975,000    
Financial liabilities:        
Credit and repurchase facilities, Principal/Notional Amount 4,493,699,000 2,238,722,000    
Credit and repurchase facilities, Carrying value 4,481,579,000 2,234,883,000    
Collateralized loan obligations 5,892,810,000 2,517,309,000    
Senior unsecured notes 1,280,545,000 662,843,000    
Convertible senior unsecured notes, net 259,385,000 267,973,000    
Junior subordinated notes 142,382,000 141,656,000    
Related party financing 0      
Derivative financial instruments - Principal/Notional Amount $ 301,816,000 319,142,000    
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 $ 11,981,048,000 5,285,868,000    
Loans held-for-sale, net 1,093,609,000 986,919,000    
Capitalized mortgage servicing rights, net 422,734,000 379,974,000    
Securities held-to-maturity, net 140,484,000 95,524,000    
Derivative financial instruments 1,665,000 3,892,000    
Financial liabilities:        
Credit and repurchase facilities, Carrying value 4,481,579,000 2,234,883,000    
Collateralized loan obligations 5,892,810,000 2,517,309,000    
Senior unsecured notes 1,280,545,000 662,843,000    
Convertible senior unsecured notes, net 259,385,000 267,973,000    
Junior subordinated notes 142,382,000 141,656,000    
Derivative financial instruments 1,482,000 1,221,000    
Estimated Fair Value Disclosure        
Financial assets:        
Loans and investments, net 12,181,194,000 5,428,141,000    
Loans held-for-sale, net 1,117,085,000 1,007,294,000    
Capitalized mortgage servicing rights, net 477,323,000 415,495,000    
Securities held-to-maturity, net 149,911,000 94,128,000    
Derivative financial instruments 1,665,000 3,892,000    
Financial liabilities:        
Credit and repurchase facilities, Carrying value 4,484,107,000 2,235,668,000    
Collateralized loan obligations 5,914,453,000 2,495,195,000    
Senior unsecured notes 1,301,708,000 670,117,000    
Convertible senior unsecured notes, net 294,690,000 280,636,000    
Junior subordinated notes 101,698,000 99,594,000    
Derivative financial instruments 1,482,000 1,221,000    
Collateralized loan obligations        
Financial liabilities:        
Collateralized loan obligations 5,892,810,000 2,517,309,000    
Debt instrument - Principal/Notional Amount 5,924,705,000 2,532,343,000    
Collateralized debt obligations        
Financial liabilities:        
Debt instrument - Principal/Notional Amount 5,924,705,000 2,532,343,000    
Senior Unsecured Notes        
Financial liabilities:        
Debt instrument - Principal/Notional Amount 1,295,750,000 670,750,000    
Convertible Senior Unsecured Notes        
Financial liabilities:        
Debt instrument - Principal/Notional Amount 264,000,000 278,300,000    
Junior subordinated notes        
Financial liabilities:        
Junior subordinated notes 142,400,000 141,700,000    
Debt instrument - Principal/Notional Amount $ 154,336,000 $ 154,336,000