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Residential Morgage Securities and MSR Related Assets (Purchase Discounts) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
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 $ (593,227) $ (694,241)
Impact of RMBS Issuer Settlement 0 0
Accretion of discount 0 0
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income Loss, Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities 42,246 49,291
Purchases (2,512) (29,810)
Sales 12,987 31,730
Net impairment losses recognized in earnings (1,259) (1,032)
Transfers/release of credit reserve 25,649 50,835
Balance at end of period (516,116) (593,227)
Accretable Discount | Non-Agency MBS    
Changes in the components of the purchase discount on Non-Agency MBS    
Balance at beginning of period (215,325) (278,191)
Impact of RMBS Issuer Settlement (14,822) 0
Accretion of discount 70,750 77,513
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income Loss, Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities 0 0
Purchases 1,685 18,386
Sales 28,336 17,802
Net impairment losses recognized in earnings 0 0
Transfers/release of credit reserve (25,649) (50,835)
Balance at end of period (155,025) $ (215,325)
Lehman Brothers    
Changes in the components of the purchase discount on Non-Agency MBS    
Proceeds from legal settlements 2,700  
Jp Morgan Chase    
Changes in the components of the purchase discount on Non-Agency MBS    
Proceeds from legal settlements $ 12,100