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Residential Mortgage Securities and MSR Related Assets (Purchase Discounts) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Discount Designated as Credit Reserve and OTTI | Non-Agency MBS    
Changes in the components of the purchase discount on Non-Agency MBS    
Balance at beginning of period $ (516,116) $ (593,227)
Impact of RMBS Issuer Settlement 0 0
Accretion of discount 0 0
Realized credit losses 28,152 42,246
Purchases (624) (2,512)
Sales/Redemptions 34,510 12,987
Net impairment losses recognized in earnings (180) (1,259)
Transfers/release of credit reserve 17,660 25,649
Balance at end of period (436,598) (516,116)
Accretable Discount | Non-Agency MBS    
Changes in the components of the purchase discount on Non-Agency MBS    
Balance at beginning of period (155,025) (215,325)
Impact of RMBS Issuer Settlement (2,077) (14,822)
Accretion of discount 51,696 70,750
Realized credit losses 0 0
Purchases (4) 1,685
Sales/Redemptions 32,453 28,336
Net impairment losses recognized in earnings 0 0
Transfers/release of credit reserve (17,660) (25,649)
Balance at end of period (90,617) (155,025)
Jp Morgan Chase    
Changes in the components of the purchase discount on Non-Agency MBS    
Proceeds from legal settlements $ 2,000 12,100
Lehman Brothers    
Changes in the components of the purchase discount on Non-Agency MBS    
Proceeds from legal settlements   $ 2,700