Schedule of Mortgage-Backed Securities by Weighted Average Life (Details) - USD ($)
$ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Mortgage-Backed Securities [Line Items] |
|
|
| Mortgage-backed securities, at fair value |
$ 1,242,266
|
$ 1,393,303
|
| Non-Agency RMBS [Member] |
|
|
| Mortgage-Backed Securities [Line Items] |
|
|
| Mortgage-backed securities, at fair value |
31,401
|
32,501
|
| Amortized Cost |
$ 30,395
|
$ 30,291
|
| Weighted Average Coupon Rate, Percent |
2.48%
|
2.29%
|
| Less than three years [Member] | Non-Agency RMBS [Member] |
|
|
| Mortgage-Backed Securities [Line Items] |
|
|
| Mortgage-backed securities, at fair value |
$ 2,558
|
$ 2,837
|
| Amortized Cost |
$ 1,543
|
$ 1,785
|
| Weighted Average Coupon Rate, Percent |
3.21%
|
3.02%
|
| Greater than three years and less than seven years [Member] | Non-Agency RMBS [Member] |
|
|
| Mortgage-Backed Securities [Line Items] |
|
|
| Mortgage-backed securities, at fair value |
$ 24,736
|
$ 17,660
|
| Amortized Cost |
$ 25,478
|
$ 17,662
|
| Weighted Average Coupon Rate, Percent |
2.66%
|
2.63%
|
| Greater than seven years and less than eleven years [Member] | Non-Agency RMBS [Member] |
|
|
| Mortgage-Backed Securities [Line Items] |
|
|
| Mortgage-backed securities, at fair value |
$ 4,107
|
$ 12,004
|
| Amortized Cost |
$ 3,374
|
$ 10,844
|
| Weighted Average Coupon Rate, Percent |
0.55%
|
1.28%
|
| Greater than eleven years [Member] | Non-Agency RMBS [Member] |
|
|
| Mortgage-Backed Securities [Line Items] |
|
|
| Mortgage-backed securities, at fair value |
$ 0
|
|
| Amortized Cost |
$ 0
|
|
| Weighted Average Coupon Rate, Percent |
0.00%
|
|
| Fixed Rate [Member] | Agency RMBS [Member] |
|
|
| Mortgage-Backed Securities [Line Items] |
|
|
| Mortgage-backed securities, at fair value |
$ 1,203,107
|
$ 1,349,558
|
| Amortized Cost |
$ 1,200,329
|
$ 1,329,680
|
| Weighted Average Coupon Rate, Percent |
4.04%
|
4.05%
|
| Fixed Rate [Member] | Less than three years [Member] | Agency RMBS [Member] |
|
|
| Mortgage-Backed Securities [Line Items] |
|
|
| Mortgage-backed securities, at fair value |
$ 30,054
|
$ 18,428
|
| Amortized Cost |
$ 30,227
|
$ 18,418
|
| Weighted Average Coupon Rate, Percent |
4.76%
|
5.13%
|
| Fixed Rate [Member] | Greater than three years and less than seven years [Member] | Agency RMBS [Member] |
|
|
| Mortgage-Backed Securities [Line Items] |
|
|
| Mortgage-backed securities, at fair value |
$ 273,477
|
$ 410,759
|
| Amortized Cost |
$ 273,107
|
$ 405,739
|
| Weighted Average Coupon Rate, Percent |
3.78%
|
4.12%
|
| Fixed Rate [Member] | Greater than seven years and less than eleven years [Member] | Agency RMBS [Member] |
|
|
| Mortgage-Backed Securities [Line Items] |
|
|
| Mortgage-backed securities, at fair value |
$ 893,730
|
$ 920,371
|
| Amortized Cost |
$ 891,112
|
$ 905,523
|
| Weighted Average Coupon Rate, Percent |
4.10%
|
4.00%
|
| Fixed Rate [Member] | Greater than eleven years [Member] | Agency RMBS [Member] |
|
|
| Mortgage-Backed Securities [Line Items] |
|
|
| Mortgage-backed securities, at fair value |
$ 5,846
|
|
| Amortized Cost |
$ 5,883
|
|
| Weighted Average Coupon Rate, Percent |
3.81%
|
|
| Interest-Only [Member] | Agency RMBS [Member] |
|
|
| Mortgage-Backed Securities [Line Items] |
|
|
| Mortgage-backed securities, at fair value |
$ 7,758
|
$ 11,244
|
| Amortized Cost |
$ 8,491
|
$ 10,780
|
| Weighted Average Coupon Rate, Percent |
3.82%
|
4.04%
|
| Interest-Only [Member] | Less than three years [Member] | Agency RMBS [Member] |
|
|
| Mortgage-Backed Securities [Line Items] |
|
|
| Mortgage-backed securities, at fair value |
$ 4,974
|
$ 5,197
|
| Amortized Cost |
$ 5,701
|
$ 5,563
|
| Weighted Average Coupon Rate, Percent |
3.55%
|
3.42%
|
| Interest-Only [Member] | Greater than three years and less than seven years [Member] | Agency RMBS [Member] |
|
|
| Mortgage-Backed Securities [Line Items] |
|
|
| Mortgage-backed securities, at fair value |
$ 2,784
|
$ 6,047
|
| Amortized Cost |
$ 2,790
|
$ 5,217
|
| Weighted Average Coupon Rate, Percent |
4.97%
|
5.19%
|
| Interest-Only [Member] | Greater than seven years and less than eleven years [Member] | Agency RMBS [Member] |
|
|
| Mortgage-Backed Securities [Line Items] |
|
|
| Mortgage-backed securities, at fair value |
$ 0
|
$ 0
|
| Amortized Cost |
$ 0
|
$ 0
|
| Weighted Average Coupon Rate, Percent |
0.00%
|
0.00%
|
| Interest-Only [Member] | Greater than eleven years [Member] | Agency RMBS [Member] |
|
|
| Mortgage-Backed Securities [Line Items] |
|
|
| Mortgage-backed securities, at fair value |
$ 0
|
|
| Amortized Cost |
$ 0
|
|
| Weighted Average Coupon Rate, Percent |
0.00%
|
|