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Other Assets (Real Estate Owned) (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
property
Dec. 31, 2019
USD ($)
property
Dec. 31, 2018
USD ($)
Real Estate Owned Properties [Line Items]      
Number of properties | property 946 1,652  
Real estate investments $ 249,699 $ 411,659 $ 249,413
Residential Whole Loans acquired through foreclosure ordered in lieu 247,200    
Estimated fair value      
Real Estate Owned Properties [Line Items]      
Mortgage loans in process of foreclosure 448,500    
Carrying value      
Real Estate Owned Properties [Line Items]      
Mortgage loans in process of foreclosure $ 116,300