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Residential Mortgage Securities and MSR Related Assets (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 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                
Available-for-sale, unrealized loss position, accumulated loss $ 1,183,000                
Allowance for credit loss 86,833,000 $ 3,025,000 $ 968,000 $ 106,246,000 $ 136,589,000 $ 218,011,000 $ 2,271,000 $ 1,986,000 $ 1,651,000
Impairment and other losses on securities available-for-sale and other assets (425,082,000) (180,000) $ (1,259,000)            
Non-Agency MBS                  
Debt Securities, Available-for-sale [Line Items]                  
Available-for-sale, unrealized loss position, accumulated loss 861,000                
Allowance for credit loss 0 $ 0              
MBS and MSR-Related Assets                  
Debt Securities, Available-for-sale [Line Items]                  
Impairment and other losses on securities available-for-sale and other assets $ (63,500,000)                
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