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Real Estate Securities (Tables)
 9 Months Ended
Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]  
Schedule of Real Estate Securities
The following tables present details of the Company's real estate securities portfolio at September 30, 2013 and December 31, 2012, respectively. The Company's Agency RMBS include mortgage pass-through certificates and CMOs representing interests in or obligations backed by pools of residential mortgage loans issued or guaranteed by government-sponsored enterprises ("GSEs"), Fannie Mae or Freddie Mac. The non-Agency RMBS portfolio is not issued or guaranteed by Fannie Mae, Freddie Mac or any agency of the U.S. Government and is therefore subject to greater credit risk.
By RMBS Type -
September 30, 2013:
($ in thousands)
 
 
 
 
 
 
Gross Unrealized
 
 
 
Weighted Average
 
Current Principal
 
Unamortized Premium (Discount)
 
Amortized
Cost
 
Gains
 
Losses
 
Fair Value
 
Coupon
 
Yield
 
Weighted Average Life(Years)(1)
Agency RMBS:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
15-year fixed rate mortgages
$
192,906

 
$
7,325

 
$
200,231

 
$
794

 
$
(1,575
)
 
$
199,450

 
3.05%
 
2.25%
 
5.86
30-year fixed rate mortgages
1,165,255

 
45,873

 
1,211,128

 
7,443

 
(24,126
)
 
1,194,445

 
3.66%
 
3.09%
 
9.99
Adjustable rate mortgages
29,840

 
1,698

 
31,538

 
169

 
—

 
31,707

 
4.47%
 
2.38%
 
3.98
Interest only securities
108,374

 
(97,019
)
 
11,355

 
1,490

 
(123
)
 
12,722

 
4.00%
 
11.95%
 
4.68
Total Agency RMBS
1,496,375

 
(42,123
)
 
1,454,252

 
9,896

 
(25,824
)
 
1,438,324

 
3.62%
 
3.03%
 
8.95
Non-Agency RMBS
55,798

 
(21,975
)
 
33,823

 
1,305

 
(661
)
 
34,467

 
2.88%
 
7.85%
 
5.44
Total Real Estate Securities
$
1,552,173

 
$
(64,098
)
 
$
1,488,075

 
$
11,201

 
$
(26,485
)
 
$
1,472,791

 
3.60%
 
3.14%
 
8.82
For the three month period ended September 30, 2013, the weighted average holdings of RMBS investments based on amortized cost was $1.453 billion.
December 31, 2012:
($ in thousands)
 
 
 
 
 
 
Gross Unrealized
 
 
 
Weighted Average
 
Current Principal
 
Unamortized Premium (Discount)
 
Amortized
Cost
 
Gains
 
Losses
 
Fair Value
 
Coupon
 
Yield
 
Weighted Average Life(Years)(1)
Non-Agency RMBS
$
26,890

 
$
(13,400
)
 
$
13,490

 
$
117

 
$
(11
)
 
$
13,596

 
2.20%
 
8.50%
 
7.80
(1)
Average lives of RMBS are generally shorter than stated contractual maturities. Average lives are affected by the contractual maturities of the underlying mortgages, scheduled periodic payments of principal, and unscheduled prepayments of principal.
Weighted Average Life Classifications [Table Text Block]
As of September 30, 2013:
($ in thousands)
 
Agency RMBS
 
Agency Interest Only Securities
 
Non-Agency RMBS
Estimated Weighted Average Life
 
Fair
Value
 
Amortized Cost
 
Weighted Average Coupon
 
Fair Value
 
Amortized Cost
 
Weighted Average Coupon
 
Fair Value
 
Amortized Cost
 
Weighted Average Coupon
Less than three years
 
$
3,859

 
$
3,859

 
6.01
%
 
$
2,169

 
$
1,601

 
5.12
%
 
$
4,616

 
$
4,291

 
1.97
%
Greater than three years and less than seven years
 
243,429

 
244,043

 
3.32
%
 
8,209

 
7,759

 
3.77
%
 
18,188

 
18,244

 
3.41
%
Greater than seven years and less than eleven years
 
1,160,705

 
1,177,237

 
3.64
%
 
2,344

 
1,995

 
3.50
%
 
10,963

 
10,477

 
1.88
%
Greater than eleven years
 
17,609

 
17,758

 
3.89
%
 
—

 
—

 
0.00
%
 
700

 
811

 
7.69
%
Total
 
$
1,425,602

 
$
1,442,897

 
3.59
%
 
$
12,722

 
$
11,355

 
4.00
%
 
$
34,467

 
$
33,823

 
2.88
%
As of December 31, 2012:
($ in thousands)
 
 
Non-Agency RMBS
Estimated Weighted Average Life
 
 
Fair Value
 
Amortized Cost
 
Weighted Average Coupon
Less than three years
 
 
$
3,036

 
$
3,001

 
5.57
%
Greater than three years and less than seven years
 
 
3,994

 
3,978

 
0.61
%
Greater than seven years and less than eleven years
 
 
3,601

 
3,608

 
1.10
%
Greater than eleven years
 
 
2,965

 
2,903

 
2.49
%
Total
 
 
$
13,596

 
$
13,490

 
2.20
%
Interest Income Components - Investments [Table Text Block]
The following table illustrates components of interest income on the Company's RMBS for the three and nine months ended September 30, 2013:
 
 
Three Month Period Ended
September 30, 2013
 
Nine Month Period Ended
September 30, 2013
($ in thousands)
 
Coupon Interest
 
Net Amortization
 
Interest Income
 
Coupon Interest
 
Net Amortization
 
Interest Income
Agency RMBS
 
$
12,570

 
$
(2,089
)
 
$
10,481

 
$
17,484

 
$
(3,129
)
 
$
14,355

Non-Agency RMBS
 
428

 
307

 
735

 
824

 
631

 
1,455

Total
 
$
12,998

 
$
(1,782
)
 
$
11,216

 
$
18,308

 
$
(2,498
)
 
$
15,810