Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Reclassification adjustment for net gains realized in earnings, tax expense	$ 412	$ 2,271	$ 471	$ 2,271
Unrealized losses related to factors other than credit, tax benefit		35		30
Reclassification adjustment for impairments realized in net income, tax benefit		10		20
Accretion of unrealized losses related to factors other than credit to investment securities held to maturity, tax benefit	$ 25	$ 10	$ 53	$ 27