Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net income	$ 24,550	$ 32,624	$ 56,237	$ 66,145
Other comprehensive income, net of tax
Net unrealized holding gains on securities available for sale arising during period (tax effects of $4,354, $29,866, $395 and $31,877)	8,086	55,465	734	59,201
Reclassification adjustment for gains on securities available for sale included in net income (tax effects of $(497), $(505), $(907) and $(1,001))	(923)	(940)	(1,685)	(1,860)
Reclassification adjustment for impairment charges on available for sale securities included in net income (tax effects of $78, $58, $143 and $145)	144	108	265	270
Other comprehensive income, net of tax	7,307	54,633	(686)	57,611
Comprehensive income	$ 31,857	$ 87,257	$ 55,551	$ 123,756