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Mortgage Backed Securities Designated as AFS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale MBS, Par Balance $ 2,422,883 $ 2,635,705  
Available-for-sale MBS, Unamortized Premium (Discount) 822,084 870,102  
Available-for-sale MBS, Amortized Cost 3,244,967 3,505,807  
Available-for-sale MBS, Gross Unrealized Gain 19,643 29,927  
Available-for-sale MBS, Gross Unrealized Loss (52,526) (42,033)  
Available-for-sale MBS, Fair Value 3,212,084 3,493,701  
Available-for-sale MBS, Sale Proceeds 87,818 449,921 $ 503,918
Available-for-sale MBS, Gross Realized Gain (Loss) (4,238) (978) 16,223
RMBS      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale MBS, Par Balance 1,190,830 1,602,736  
Available-for-sale MBS, Unamortized Premium (Discount) 57,042 77,572  
Available-for-sale MBS, Amortized Cost 1,247,872 1,680,308  
Available-for-sale MBS, Gross Unrealized Gain 2,896 4,432  
Available-for-sale MBS, Gross Unrealized Loss (16,001) (21,008)  
Available-for-sale MBS, Fair Value 1,234,767 1,663,732  
CMBS      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale MBS, Par Balance 1,232,053 1,032,969  
Available-for-sale MBS, Unamortized Premium (Discount) 7,150 5,119  
Available-for-sale MBS, Amortized Cost 1,239,203 1,038,088  
Available-for-sale MBS, Gross Unrealized Gain 11,676 17,581  
Available-for-sale MBS, Gross Unrealized Loss (28,108) (15,555)  
Available-for-sale MBS, Fair Value 1,222,771 1,040,114  
CMBS IO      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale MBS, Par Balance 0 0  
Available-for-sale MBS, Unamortized Premium (Discount) 757,892 787,411  
Available-for-sale MBS, Amortized Cost 757,892 787,411  
Available-for-sale MBS, Gross Unrealized Gain 5,071 7,914  
Available-for-sale MBS, Gross Unrealized Loss (8,417) (5,470)  
Available-for-sale MBS, Fair Value 754,546 789,855  
Agency MBS      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale MBS, Continuous Unrealized Loss Position for less than 12 months, Fair Value 1,738,094 1,332,849  
Available-for-sale MBS, Continuous Unrealized Loss Position for less than 12 months, Accumulated Loss $ (38,469) $ (19,062)  
Available-for-sale MBS, Number of Securities in Continuous Unrealized Loss Position for less than 12 months 133 109  
Available-for-sale MBS, Continuous Unrealized Loss Position for 12 months or longer, Fair Value $ 427,405 $ 775,484  
Available-for-sale MBS, Continuous Unrealized Loss Position for 12 months or longer, Accumulated Loss $ (8,952) $ (17,393)  
Available-for-sale MBS, Number of Securities in Continuous Unrealized Loss Position for 12 months or longer 72 72  
Agency MBS | RMBS      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale MBS, Par Balance $ 1,157,258 $ 1,536,733  
Available-for-sale MBS, Unamortized Premium (Discount) 57,066 77,617  
Available-for-sale MBS, Amortized Cost 1,214,324 1,614,350  
Available-for-sale MBS, Gross Unrealized Gain 2,832 4,362  
Available-for-sale MBS, Gross Unrealized Loss (15,951) (20,190)  
Available-for-sale MBS, Fair Value $ 1,201,205 $ 1,598,522  
Available-for-sale MBS, Weighted Average Coupon [1] 3.05% 3.03%  
Available-for-sale MBS, Sale Proceeds $ 54,178 $ 174,565 137,350
Available-for-sale MBS, Gross Realized Gain (Loss) 3,010 2,865 5,762
Agency MBS | CMBS      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale MBS, Par Balance 1,152,586 876,751  
Available-for-sale MBS, Unamortized Premium (Discount) 13,868 13,252  
Available-for-sale MBS, Amortized Cost 1,166,454 890,003  
Available-for-sale MBS, Gross Unrealized Gain 6,209 10,542  
Available-for-sale MBS, Gross Unrealized Loss (28,108) (14,614)  
Available-for-sale MBS, Fair Value $ 1,144,555 $ 885,931  
Available-for-sale MBS, Weighted Average Coupon [1] 3.12% 3.45%  
Available-for-sale MBS, Sale Proceeds   $ 149,360  
Available-for-sale MBS, Gross Realized Gain (Loss)   604  
Agency MBS | CMBS IO      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale MBS, Par Balance $ 0 [2] 0 [3]  
Available-for-sale MBS, Unamortized Premium (Discount) 411,737 421,857  
Available-for-sale MBS, Amortized Cost 411,737 421,857  
Available-for-sale MBS, Gross Unrealized Gain 3,523 5,922  
Available-for-sale MBS, Gross Unrealized Loss (3,362) (1,651)  
Available-for-sale MBS, Fair Value $ 411,898 $ 426,128  
Available-for-sale MBS, Weighted Average Coupon [1] 0.67% 0.80%  
Notional balance for interest only securities $ 13,106,912 $ 12,180,291  
Available-for-sale MBS, Sale Proceeds   45,096 107,635
Available-for-sale MBS, Gross Realized Gain (Loss)   1,698 1,630
Non-Agency MBS      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale MBS, Continuous Unrealized Loss Position for less than 12 months, Fair Value 205,484 351,650  
Available-for-sale MBS, Continuous Unrealized Loss Position for less than 12 months, Accumulated Loss $ (2,773) $ (5,347)  
Available-for-sale MBS, Number of Securities in Continuous Unrealized Loss Position for less than 12 months 48 72  
Available-for-sale MBS, Continuous Unrealized Loss Position for 12 months or longer, Fair Value $ 81,660 $ 8,306  
Available-for-sale MBS, Continuous Unrealized Loss Position for 12 months or longer, Accumulated Loss $ (2,332) $ (231)  
Available-for-sale MBS, Number of Securities in Continuous Unrealized Loss Position for 12 months or longer 26 7  
Non-Agency MBS | RMBS      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale MBS, Par Balance $ 33,572 $ 66,003  
Available-for-sale MBS, Unamortized Premium (Discount) (24) (45)  
Available-for-sale MBS, Amortized Cost 33,548 65,958  
Available-for-sale MBS, Gross Unrealized Gain 64 70  
Available-for-sale MBS, Gross Unrealized Loss (50) (818)  
Available-for-sale MBS, Fair Value $ 33,562 $ 65,210  
Available-for-sale MBS, Weighted Average Coupon [1] 3.58% 3.25%  
Non-Agency MBS | CMBS      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale MBS, Par Balance $ 79,467 $ 156,218  
Available-for-sale MBS, Unamortized Premium (Discount) (6,718) (8,133)  
Available-for-sale MBS, Amortized Cost 72,749 148,085  
Available-for-sale MBS, Gross Unrealized Gain 5,467 7,039  
Available-for-sale MBS, Gross Unrealized Loss 0 (941)  
Available-for-sale MBS, Fair Value $ 78,216 $ 154,183  
Available-for-sale MBS, Weighted Average Coupon [1] 4.72% 4.29%  
Available-for-sale MBS, Sale Proceeds $ 33,640 $ 30,775 245,839
Available-for-sale MBS, Gross Realized Gain (Loss) 1,228 566 19,773
Non-Agency MBS | CMBS IO      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale MBS, Par Balance [2] 0    
Available-for-sale MBS, Unamortized Premium (Discount) 346,155 365,554  
Available-for-sale MBS, Amortized Cost 346,155 365,554  
Available-for-sale MBS, Gross Unrealized Gain 1,548 1,992  
Available-for-sale MBS, Gross Unrealized Loss (5,055) (3,819)  
Available-for-sale MBS, Fair Value $ 342,648 $ 363,727  
Available-for-sale MBS, Weighted Average Coupon [1] 0.61% 0.71%  
Notional balance for interest only securities $ 10,884,964 $ 10,328,628  
Available-for-sale MBS, Sale Proceeds   50,125 13,094
Available-for-sale MBS, Gross Realized Gain (Loss)   $ 1,359 $ 582
[1] The 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] The notional balance for Agency CMBS IO and non-Agency CMBS IO was $13,106,912 and $10,884,964, respectively, as of December 31, 2016.
[3] The notional balance for the Agency CMBS IO and non-Agency CMBS IO was $12,180,291 and $10,328,628, respectively, as of December 31, 2015.