Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net income (loss)	$ (12,477)	$ 70,739	$ 4,321	$ 137,978
Other comprehensive income:
Net unrealized gains (losses) on securities available for sale	81,034	(627,560)	115,172	(646,412)
Net unrealized gains on derivative instruments	24,636	37,679	57,103	62,725
Other comprehensive income (loss)	105,670	(589,881)	172,275	(583,687)
Comprehensive income (loss)	$ 93,193	$ (519,142)	$ 176,596	$ (445,709)