Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Consolidated Statements of Comprehensive Income
Net income	$ 31,826	$ 25,878	$ 87,408	$ 82,115
Other comprehensive income, net of tax
Net unrealized holding gains (losses) on securities available for Sale arising during period (tax effects of $609, $10,897, $(39,816) and $11,292)	1,132	20,238	(73,943)	20,971
Reclassification adjustment for gains on securities available for sale included in net income (tax effects of $0, $(11,527), $(3,360) and $(12,434))		(21,408)	(6,241)	(23,093)
Reclassification adjustment for impairment charges on available for sale securities included in net income (tax effects of $201, $84, $455 and $226)	372	155	845	421
Other comprehensive loss, net of tax	1,504	(1,015)	(79,339)	(1,701)
Comprehensive income	$ 33,330	$ 24,863	$ 8,069	$ 80,414