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Repurchase Agreements (Borrowings Under Repurchase Agreement And Associated Assets Pledged as Collateral) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Assets Sold under Agreements to Repurchase [Line Items]      
Balance of repurchase agreements $ 7,768,180   $ 9,139,821
Fair value of securities pledged as collateral under repurchase agreements 9,000,000   11,300,000
Total Fair Value of Assets Pledged and Accrued Interest 56,000   57,200
Residential whole loans      
Assets Sold under Agreements to Repurchase [Line Items]      
Balance of repurchase agreements 4,700,931   4,743,094
Fair value of securities pledged as collateral under repurchase agreements $ 5,665,277   $ 5,986,267
Weighted average haircut (percent) 19.17%   20.07%
Agency MBS      
Assets Sold under Agreements to Repurchase [Line Items]      
Balance of repurchase agreements $ 522,209   $ 1,557,675
Fair value of securities pledged as collateral under repurchase agreements $ 568,704   $ 1,656,373
Weighted average haircut (percent) 4.99%   4.46%
Non-Agency MBS      
Assets Sold under Agreements to Repurchase [Line Items]      
Balance of repurchase agreements $ 1,003,122   $ 1,121,802
Fair value of securities pledged as collateral under repurchase agreements $ 1,088,549   $ 1,420,797
Weighted average haircut (percent) 21.60%   20.27%
RPL/NPL MBS      
Assets Sold under Agreements to Repurchase [Line Items]      
Balance of repurchase agreements $ 255,409   $ 495,091
Fair value of securities pledged as collateral under repurchase agreements $ 243,125   $ 635,005
Weighted average haircut (percent) 20.30%   21.52%
CRT securities      
Assets Sold under Agreements to Repurchase [Line Items]      
Balance of repurchase agreements $ 297,628   $ 203,569
Fair value of securities pledged as collateral under repurchase agreements $ 263,225   $ 252,175
Weighted average haircut (percent) 20.89%   18.84%
MSR-related assets      
Assets Sold under Agreements to Repurchase [Line Items]      
Balance of repurchase agreements $ 929,915   $ 962,515
Fair value of securities pledged as collateral under repurchase agreements $ 877,204   $ 1,217,002
Weighted average haircut (percent) 22.11%   21.18%
Other Interest Earning Assets      
Assets Sold under Agreements to Repurchase [Line Items]      
Balance of repurchase agreements $ 59,777   $ 57,198
Fair value of securities pledged as collateral under repurchase agreements $ 71,837   $ 61,708
Weighted average haircut (percent) 21.88%   22.01%
Repurchase Agreement Borrowings      
Assets Sold under Agreements to Repurchase [Line Items]      
Weighted average remaining term-to-interest rate reset of borrowings under repurchase agreements, days 28 days 40 days  
Effective repricing period, months 11 months 10 months  
Balance of repurchase agreements $ 7,768,991   $ 9,140,944
Unamortized debt issuance expense 811   1,123
Loan Securitization      
Assets Sold under Agreements to Repurchase [Line Items]      
Fair value of securities pledged as collateral under repurchase agreements 193,900   238,800
Residential Loans At Fair Value      
Assets Sold under Agreements to Repurchase [Line Items]      
Fair Value 4,800,000   5,000,000
Amortized Cost 5,100,000   4,800,000
Total Fair Value of Assets Pledged and Accrued Interest $ 718,300   $ 794,700