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Schedule of Mortgage-Backed Securities (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2016	Dec. 31, 2015
Mortgage-Backed Securities [Line Items]
Fair Value		$ 1,173,593	$ 1,242,266
Residential Mortgage Backed Securities [Member]
Mortgage-Backed Securities [Line Items]
Current Principal		1,098,469	1,177,078
Unamortized Premium (Discount)		53,286	53,646
Amortized Cost		1,160,415	1,239,215
Gross Unrealized Gain		17,225	11,428
Gross Unrealized Losses		(4,047)	(8,377)
Fair Value		$ 1,173,593	$ 1,242,266
Weighted Average Coupon		3.98%	3.97%
Weighted Average Yield		3.02%	3.39%
Weighted Average Life (Years)	[1]	6 years 139 days	7 years 26 days
Non-Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal		$ 42,649	$ 48,408
Unamortized Premium (Discount)		(16,474)	(18,013)
Amortized Cost		26,175	30,395
Gross Unrealized Gain		2,358	2,264
Gross Unrealized Losses		(902)	(1,258)
Fair Value		$ 27,631	$ 31,401
Weighted Average Coupon		2.62%	2.48%
Weighted Average Yield		8.47%	20.97%
Weighted Average Life (Years)	[1]	4 years 201 days	4 years 296 days
15-year fixed rate mortgages [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal		$ 143,705	$ 162,546
Unamortized Premium (Discount)		7,240	7,839
Amortized Cost		150,945	170,385
Gross Unrealized Gain		1,632	531
Gross Unrealized Losses		(41)	(655)
Fair Value		$ 152,536	$ 170,261
Weighted Average Coupon		3.43%	3.38%
Weighted Average Yield		2.26%	2.31%
Weighted Average Life (Years)	[1]	4 years 208 days	4 years 361 days
20-year fixed rate mortgages [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal		$ 17,991	$ 18,477
Unamortized Premium (Discount)		1,235	1,277
Amortized Cost		19,226	19,754
Gross Unrealized Gain		262	153
Gross Unrealized Losses		0	(77)
Fair Value		$ 19,488	$ 19,830
Weighted Average Coupon		4.00%	4.00%
Weighted Average Yield		2.73%	2.75%
Weighted Average Life (Years)	[1]	5 years 274 days	6 years 183 days
30-year fixed rate mortgages [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal		$ 788,135	$ 842,524
Unamortized Premium (Discount)		52,863	53,832
Amortized Cost		840,998	896,356
Gross Unrealized Gain		12,218	8,117
Gross Unrealized Losses		(890)	(3,679)
Fair Value		$ 852,326	$ 900,794
Weighted Average Coupon		4.11%	4.12%
Weighted Average Yield		3.04%	3.11%
Weighted Average Life (Years)	[1]	7 years 175 days	8 years 106 days
Adjustable Rate Mortgages | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal		$ 35,122	$ 36,433
Unamortized Premium (Discount)		2,110	2,196
Amortized Cost		37,232	38,629
Gross Unrealized Gain		108	81
Gross Unrealized Losses		(207)	(180)
Fair Value		$ 37,133	$ 38,530
Weighted Average Coupon		4.05%	4.05%
Weighted Average Yield		2.70%	2.68%
Weighted Average Life (Years)	[1]	4 years 358 days	5 years 161 days
Reverse mortgages [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal		$ 70,867	$ 68,690
Unamortized Premium (Discount)		6,312	6,515
Amortized Cost		77,179	75,205
Gross Unrealized Gain		597	34
Gross Unrealized Losses		(228)	(1,547)
Fair Value		$ 77,548	$ 73,692
Weighted Average Coupon		4.56%	4.63%
Weighted Average Yield		2.45%	2.54%
Weighted Average Life (Years)	[1]	5 years 175 days	5 years 234 days
Interest-Only [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Amortized Cost		$ 8,660	$ 8,491
Gross Unrealized Gain		50	248
Gross Unrealized Losses		(1,779)	(981)
Fair Value		$ 6,931	$ 7,758
Weighted Average Coupon		3.88%	3.82%
Weighted Average Yield		4.89%	3.30%
Weighted Average Life (Years)	[1]	1 year 332 days	2 years 131 days
Agency Securities [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal		$ 1,055,820	$ 1,128,670
Unamortized Premium (Discount)		69,760	71,659
Amortized Cost		1,134,240	1,208,820
Gross Unrealized Gain		14,867	9,164
Gross Unrealized Losses		(3,145)	(7,119)
Fair Value		$ 1,145,962	$ 1,210,865
Weighted Average Coupon		4.03%	4.03%
Weighted Average Yield		2.89%	2.94%
Weighted Average Life (Years)	[1]	6 years 164 days	7 years 58 days
[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.

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