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Loan Securitization/Sale Activities - Loans (Details) - USD ($)
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Investing and Servicing Segment | Commercial Loans    
Loan Transfer Activities    
Face Amount $ 12,196,000 $ 347,442,000
Proceeds 13,439,000 342,067,000
Investing and Servicing Segment | Residential Loans    
Loan Transfer Activities    
Face Amount 0 1,077,958,000
Proceeds 0 1,100,284,000
Commercial and Residential Lending Segment    
Loan Transfer Activities    
Face Amount 0 0
Commercial and Residential Lending Segment | Residential Loans    
Loan Transfers Accounted for as Sales Residential Loans    
Face Amount 0 835,760,000
Proceeds $ 0 $ 836,116,000