Stockholders' Equity (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Amounts Reclassified from AOCI
Realized gain on sale of securities	$ 6,748		$ 3,254		$ 9,699		$ 4,554
De-designated Swaps	0		0		(447)		0
Accumulated Other Comprehensive Income/(Loss)
Other-than-temporary impairments recognized in accumulated other comprehensive(loss)/income	605				605				609
Available-for-sale MBS
Amounts Reclassified from AOCI
Total reclassifications for period	6,748	[1]	3,254	[1]	9,699	[1]	4,554	[1]
Swaps Designated as Cash Flow Hedges
Amounts Reclassified from AOCI
Total reclassifications for period	0	[1]	0	[1]	(447)	[1]	0	[1]
Amounts Reclassified from AOCI
Amounts Reclassified from AOCI
Total reclassifications for period	(6,748)				(9,252)
Amounts Reclassified from AOCI | Available-for-sale MBS
Amounts Reclassified from AOCI
Realized gain on sale of securities	(6,748)		(3,254)		(9,699)		(4,554)
Total reclassifications for period			(3,254)				(4,554)
Amounts Reclassified from AOCI | Swaps Designated as Cash Flow Hedges
Amounts Reclassified from AOCI
De-designated Swaps	$ 0				$ 447

[1] See separate table below for details about these reclassifications.