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Loan Securitization/Sale Activities - Summary of Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Investing and Servicing Segment | Commercial Loans      
Loan Transfer Activities      
Face Amount $ 1,185,251 $ 920,282 $ 1,781,981
Proceeds 1,242,974 975,569 1,845,890
Investing and Servicing Segment | Residential Loans      
Loan Transfer Activities      
Face Amount 2,287,733 1,770,513 1,256,481
Proceeds 2,362,798 1,826,549 1,305,059
Commercial and Residential Lending Segment | Commercial Loans      
Loan Transfers Accounted for as Sales      
Face Amount 335,552 446,132 751,210
Proceeds 328,878 442,833 748,045
Commercial and Residential Lending Segment | Residential Loans      
Loan Transfers Accounted for as Sales      
Face Amount 216,827 550 26,046
Proceeds 225,940 604 $ 26,797
First Mortgage Loans      
Loan Transfers Accounted for as Sales      
Face Amount 313,000 277,900  
Proceeds from sale of mortgage loans 307,300 270,800  
Whole Loan Interest      
Loan Transfers Accounted for as Sales      
Face Amount 22,600 168,200  
Proceeds from sale of mortgage loans $ 21,500 $ 172,000