Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidated Statements of Comprehensive Income
Net income	$ 17,785	$ 3,463	$ 31,252	$ 11,977
Available for sale securities:
Unrealized gains arising during the period	24,835	14,249	25,649	28,094
Reclassification adjustment for net gains realized in earnings (net of tax expense of $2,271 for the three months ended June 30, 2011 and net of tax expense of $2,271 and $1 for the six months ended June 30, 2011 and 2010, respectively)	(3,407)		(3,407)	(1)
Income tax expense related to unrealized gains	(9,934)	(5,699)	(10,259)	(11,238)
Net change in unrealized gains	11,494	8,550	11,983	16,855
Held to maturity securities:
Unrealized (losses) gains related to factors other than credit (net of tax benefit of $35 and $30 for the three and six months ended June 30, 2011, respectively, and tax expense of $69 for the six months ended June 30, 2010)	(53)		(45)	103
Reclassification adjustment for impairments realized in net income (net of tax benefit of $10 for the three months ended June 30, 2011, and net of tax benefit of $20 and $116 for the six months ended June 30, 2011 and 2010, respectively)	15		30	173
Accretion of unrealized losses related to factors other than credit to investment securities held to maturity (net of tax benefit of $10 and $34 for the three months ended June 30, 2011 and 2010, respectively, and net of tax benefit of $27 and $74 for the six months ended June 30, 2011 and 2010, respectively)	15	50	41	112
Net change in unrealized losses related to factors other than credit	(23)	50	26	388
Other comprehensive income, net of tax	11,471	8,600	12,009	17,243
Comprehensive income	$ 29,256	$ 12,063	$ 43,261	$ 29,220