Stockholders' Equity (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Amounts Reclassified from AOCI
Realized gain on sale of securities	$ (13,589)		$ (15,158)		$ (21,180)		$ (17,398)
De-designated Swaps	0		0		447		0
Accumulated Other Comprehensive Income/(Loss)
Other-than-temporary impairments recognized in accumulated other comprehensive income/(loss)	618				618				609
Available-for-sale MBS
Amounts Reclassified from AOCI
Total reclassifications for period	(13,589)	[1]	(15,158)	[1]	(21,180)	[1]	(17,398)	[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	(13,589)				(20,733)
Amounts Reclassified from AOCI | Available-for-sale MBS
Amounts Reclassified from AOCI
Realized gain on sale of securities	(13,589)		(15,158)		(21,180)		(17,398)
Total reclassifications for period			(15,158)				(17,398)
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.