Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements Of Comprehensive Income [Abstract]
Reclassification adjustment for net gains realized in earnings, tax expense (benefit)	$ 1,609	$ 3,094	$ 930
Unrealized losses related to factors other than credit, tax expense (benefit)		(34)	150
Reclassification adjustment for impairments realized in net income, tax expense (benefit)	(42)	(108)	(137)
Accretion of unrealized losses related to factors other than credit to investment securities held to maturity, tax expense (benefit)	$ (84)	$ (66)	$ (115)