Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Consolidated Statements of Comprehensive Income
Net income	$ 43,646	$ 28,069
Other comprehensive income, net of tax:
Net unrealized holding gains (losses) on securities available for sale arising during period (tax effects of $13,616 and $(5,143))	25,289	(9,552)
Reclassification adjustment for gains on securities available for sale included in net income (tax effects of $(2,838) and $(3,360))	(5,270)	(6,241)
Reclassification adjustment for impairment charges on available for sale securities included in net income (tax effects of $31 and $108)	59	202
Other comprehensive income (loss), net of tax	20,078	(15,591)
Comprehensive income	$ 63,724	$ 12,478