Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Reclassification adjustment for net gains realized in earnings, tax expense	$ 8	$ 725	$ 480	$ 2,996
Unrealized losses related to factors other than credit, tax benefit				30
Reclassification adjustment for impairments realized in net income, tax benefit				20
Accretion of unrealized losses related to factors other than credit to investment securities held to maturity, tax benefit	$ 23	$ 17	$ 76	$ 44