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Mortgage Backed Securities Designated as AFS (Details) - USD ($) $ in Thousands | 12 Months Ended
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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.

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- Definition This item represents the current weighted-average gross interest rate earned on this type of MBS in the investment portfolio as of the period indicated. The gross interest rate of each MBS within the portfolio is weighted based on its current outstanding notional or par balance. The current outstanding notional or par balance for each MBS consists of the total of all principal balances remaining on the mortgage loans underlying each MBS. + References No definition available. + Details
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