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Financing Agreements (Borrowings Under Repurchase Agreement And Associated Assets Pledged as Collateral) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Assets Sold under Agreements to Repurchase [Line Items]    
Fair value of securities pledged as collateral under repurchase agreements $ 5,200,000 $ 11,300,000
Non Mark to Market Financing Facilities    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying Value 1,471,269 0
Fair value of securities pledged as collateral under repurchase agreements $ 2,323,085 $ 0
Weighted average haircut (percent) 41.91% 0.00%
Financing agreements with non-mark-to-market collateral provisions    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying Value $ 256,138 $ 0
Fair value of securities pledged as collateral under repurchase agreements $ 435,081 $ 0
Weighted average haircut (percent) 41.25% 0.00%
Residential whole loans    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying Value $ 1,231,734 $ 4,743,094
Fair value of securities pledged as collateral under repurchase agreements $ 2,002,903 $ 5,986,267
Weighted average haircut (percent) 30.88% 20.07%
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying Value $ 0 $ 1,557,675
Fair value of securities pledged as collateral under repurchase agreements $ 0 $ 1,656,373
Weighted average haircut (percent) 0.00% 4.46%
Non-Agency MBS    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying Value $ 1,282 $ 1,121,802
Fair value of securities pledged as collateral under repurchase agreements $ 2,621 $ 1,420,797
Weighted average haircut (percent) 50.00% 20.27%
RPL/NPL MBS    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying Value $ 32,950 $ 495,091
Fair value of securities pledged as collateral under repurchase agreements $ 53,809 $ 635,005
Weighted average haircut (percent) 38.75% 21.52%
CRT securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying Value $ 54,883 $ 203,569
Fair value of securities pledged as collateral under repurchase agreements $ 96,336 $ 252,175
Weighted average haircut (percent) 42.47% 18.84%
MSR-related assets    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying Value $ 135,340 $ 962,515
Fair value of securities pledged as collateral under repurchase agreements $ 252,183 $ 1,217,002
Weighted average haircut (percent) 39.87% 21.18%
Other Interest Earning Assets    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying Value $ 34,082 $ 57,198
Fair value of securities pledged as collateral under repurchase agreements $ 44,079 $ 61,708
Weighted average haircut (percent) 25.00% 22.01%
Repurchase Agreement Borrowings    
Assets Sold under Agreements to Repurchase [Line Items]    
Unamortized debt issuance expense $ 0 $ 1,123
Loan Securitization    
Assets Sold under Agreements to Repurchase [Line Items]    
Fair value of securities pledged as collateral under repurchase agreements 192,700 238,800
Financing Agreement    
Assets Sold under Agreements to Repurchase [Line Items]    
Cash pledged as collateral $ 5,300 $ 25,200