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Other Assets (Real Estate Owned) (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
property
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
property
Sep. 30, 2020
USD ($)
property
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Real Estate Properties [Line Items]            
Number of real estate owned properties | property 674   946 1,131    
Real estate owned $ 178,802 $ 204,762 $ 249,699 $ 298,867 $ 348,516 $ 411,659
Residential Whole Loans acquired through foreclosure ordered in lieu 176,300          
Carrying Value            
Real Estate Properties [Line Items]            
Mortgage loans in process of foreclosure 96,600          
Estimated Fair Value            
Real Estate Properties [Line Items]            
Mortgage loans in process of foreclosure $ 391,500