Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statements of Comprehensive Income
Net unrealized holding gains on securities available for sale arising during period, tax effects	$ 29,866	$ 9,567	$ 31,877	$ 9,746
Reclassification adjustment for gains on securities available for sale included in net income, tax effects	(505)	(901)	(1,001)	(10,793)
Reclassification adjustment for impairment charges on available for sale securities included in net income, tax effects	$ 58	$ 90	$ 145	$ 2,611