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Mortgage Backed Securities Mortgage backed securities designated as AFS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance $ 2,982,434   $ 2,982,434   $ 2,621,540
Available-for-sale MBS, Unamortized Premium (Discount) 863,273   863,273   868,984
Available-for-sale MBS, Amortized Cost 3,845,707   3,845,707   3,490,524
Available-for-sale Debt Securities, Gross Unrealized Gain 41,255   41,255   48,868
Available-for-sale MBS, Gross Unrealized Loss (34,079)   (34,079)   (23,153)
Available-for-sale MBS, Fair Value 3,852,883   3,852,883   3,516,239
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds 226,884 $ 36,133 329,406 $ 95,932  
Available-for-sale Securities, Gross Realized Gains 1,361 471 3,134 690  
Available-for-sale Securities, Gross Realized Losses (2,852) (948) (3,317) (4,474)  
Available-for-sale Securities, Gross Realized Gain (Loss) (1,491) $ (477) (183) $ (3,784)  
RMBS [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance 1,815,892   1,815,892    
Available-for-sale MBS, Unamortized Premium (Discount) 90,182   90,182    
Available-for-sale MBS, Amortized Cost 1,906,074   1,906,074    
Available-for-sale Debt Securities, Gross Unrealized Gain 7,839   7,839   8,580
Available-for-sale MBS, Gross Unrealized Loss (16,759)   (16,759)   (22,289)
Available-for-sale MBS, Fair Value 1,897,154   1,897,154    
CMBS [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance 1,166,542   1,166,542    
Available-for-sale MBS, Unamortized Premium (Discount) 7,947   7,947    
Available-for-sale MBS, Amortized Cost 1,174,489   1,174,489    
Available-for-sale Debt Securities, Gross Unrealized Gain 20,270   20,270   21,967
Available-for-sale MBS, Gross Unrealized Loss (15,921)   (15,921)   (555)
Available-for-sale MBS, Fair Value 1,178,838   1,178,838    
CMBS IO [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance 0   0   0
Available-for-sale MBS, Unamortized Premium (Discount) 765,144   765,144   745,844
Available-for-sale MBS, Amortized Cost 765,144   765,144   745,844
Available-for-sale Debt Securities, Gross Unrealized Gain 13,146   13,146   18,321
Available-for-sale MBS, Gross Unrealized Loss (1,399)   (1,399)   (309)
Available-for-sale MBS, Fair Value 776,891   776,891    
Agency MBS [Member] | RMBS [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance 1,741,996   1,741,996   2,086,807
Available-for-sale MBS, Unamortized Premium (Discount) 90,244   90,244   113,635
Available-for-sale MBS, Amortized Cost 1,832,240   1,832,240   2,200,442
Available-for-sale Debt Securities, Gross Unrealized Gain 7,703   7,703   8,473
Available-for-sale MBS, Gross Unrealized Loss (16,671)   (16,671)   $ (22,215)
Available-for-sale MBS, Fair Value $ 1,823,272   $ 1,823,272    
Available-for-sale MBS, Weighted Average Coupon 3.05% [1]   3.05% [1]   3.09%
Agency MBS [Member] | CMBS [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance $ 952,322   $ 952,322   $ 301,943
Available-for-sale MBS, Unamortized Premium (Discount) 16,331   16,331   18,042
Available-for-sale MBS, Amortized Cost 968,653   968,653   319,985
Available-for-sale Debt Securities, Gross Unrealized Gain 13,749   13,749   15,288
Available-for-sale MBS, Gross Unrealized Loss (15,499)   (15,499)   $ (76)
Available-for-sale MBS, Fair Value $ 966,903   $ 966,903    
Available-for-sale MBS, Weighted Average Coupon 3.45% [1]   3.45% [1]   5.21%
Agency MBS [Member] | CMBS IO [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance [2] $ 0   $ 0    
Available-for-sale MBS, Unamortized Premium (Discount) 426,897   426,897   $ 426,564
Available-for-sale MBS, Amortized Cost 426,897   426,897   426,564
Available-for-sale Debt Securities, Gross Unrealized Gain 9,258   9,258   12,252
Available-for-sale MBS, Gross Unrealized Loss (494)   (494)   (79)
Available-for-sale MBS, Fair Value $ 435,661   $ 435,661   $ 438,737
Available-for-sale MBS, Weighted Average Coupon 0.72% [1]   0.72% [1]   0.80%
Notional balance for interest only securities $ 11,198,955   $ 11,198,955   $ 10,460,113
Non-Agency MBS [Member] | RMBS [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance 73,896   73,896   22,432
Available-for-sale MBS, Unamortized Premium (Discount) (62)   (62)   (17)
Available-for-sale MBS, Amortized Cost 73,834   73,834   22,415
Available-for-sale Debt Securities, Gross Unrealized Gain 136   136   107
Available-for-sale MBS, Gross Unrealized Loss (88)   (88)   (74)
Available-for-sale MBS, Fair Value $ 73,882   $ 73,882   $ 22,448
Available-for-sale MBS, Weighted Average Coupon 3.55% [1]   3.55% [1]   3.83%
Non-Agency MBS [Member] | CMBS [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance $ 214,220   $ 214,220   $ 210,358
Available-for-sale MBS, Unamortized Premium (Discount) (8,384)   (8,384)   (8,520)
Available-for-sale MBS, Amortized Cost 205,836   205,836   201,838
Available-for-sale Debt Securities, Gross Unrealized Gain 6,521   6,521   6,679
Available-for-sale MBS, Gross Unrealized Loss (422)   (422)   (479)
Available-for-sale MBS, Fair Value $ 211,935   $ 211,935    
Available-for-sale MBS, Weighted Average Coupon [1] 4.22%   4.22%    
Non-Agency MBS [Member] | CMBS IO [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Par Balance [2] $ 0   $ 0    
Available-for-sale MBS, Unamortized Premium (Discount) 338,247   338,247   319,280
Available-for-sale MBS, Amortized Cost 338,247   338,247   319,280
Available-for-sale Debt Securities, Gross Unrealized Gain 3,888   3,888   6,069
Available-for-sale MBS, Gross Unrealized Loss (905)   (905)   (230)
Available-for-sale MBS, Fair Value $ 341,230   $ 341,230   $ 325,119
Available-for-sale MBS, Weighted Average Coupon 0.61% [1]   0.61% [1]   0.72%
Notional balance for interest only securities $ 9,572,727   $ 9,572,727   $ 7,868,896
Agency MBS [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 1,052,413   1,052,413   322,741
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (17,343)   $ (17,343)   $ (879)
Available-for-sale MBS, Number of Securities in Continuous Unrealized Loss Position for Less than One Year 68   68   24
Available-for-sale MBS, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value $ 886,126   $ 886,126   $ 1,321,323
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ (15,321)   $ (15,321)   $ (21,491)
Available-for-sale MBS, Number of Securities in Continuous Unrealized Loss Position for Greater than or Equal to One Year 73   73   113
Non-Agency MBS [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale MBS, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 212,569   $ 212,569   $ 111,778
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (1,349)   $ (1,349)   $ (625)
Available-for-sale MBS, Number of Securities in Continuous Unrealized Loss Position for Less than One Year 39   39   24
Available-for-sale MBS, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value $ 1,348   $ 1,348   $ 18,037
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ (66)   $ (66)   $ (159)
Available-for-sale MBS, Number of Securities in Continuous Unrealized Loss Position for Greater than or Equal to One Year 5   5   5
[1] (1) The current weighted average coupon ("WAC") is the gross interest rate of the pool of mortgages underlying the security weighted by the outstanding principal balance (or by notional balance in the case of an IO security).
[2] (2)The notional balance for Agency CMBS IO and non-Agency CMBS IO was $11,198,955 and $9,572,727, respectively, as of June 30, 2015.