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Residential Mortgage Securities and MSR-Related Assets (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Debt Securities, Available-for-sale [Line Items]        
Minimum term of fixed rate mortgages underlying MBS     15 years  
Maximum term of fixed rate mortgages underlying MBS     30 years  
Impairment and other losses on securities available-for-sale and other assets $ (221) $ 0 $ (424,966) $ 0
Available-for-sale, unrealized loss position, accumulated loss 6,092   6,092  
Loans in Unrealized Loss Position        
Debt Securities, Available-for-sale [Line Items]        
Impairment and other losses on securities available-for-sale and other assets     (63,500)  
Non-Agency MBS        
Debt Securities, Available-for-sale [Line Items]        
Available-for-sale, unrealized loss position, accumulated loss $ 3,000   $ 3,000  
Minimum | RPL/NPL MBS        
Debt Securities, Available-for-sale [Line Items]        
Debt instrument, basis spread on variable rate     3.00%  
Debt instrument, coupon step-up period     36 months  
Maximum | RPL/NPL MBS        
Debt Securities, Available-for-sale [Line Items]        
Debt instrument, basis spread on variable rate     4.00%  
Debt instrument, coupon step-up period     48 months