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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]      
Net change in unrealized losses on available for sale securities, net of reclassification and taxes $ 7,772 $ 1,375 $ 1,111
Change in fair value of interest rate swap agreement designated as a cash flow hedge, tax (280) (58) 110
Change in actuarial gain, net of amortization and tax effects for post-employment health care plan, tax $ (261) $ (132) $ (74)
Common shares issued   3,365,853  
Restricted stock award grants shares 17,900 16,500 14,159
Forfeiture of restricted stock award grants shares 1,488 1,343 1,701
Exercise of stock options shares including tax benefit 28,750 8,206 63,712
Reissue of treasury stock shares 94,895 86,772 89,047
Cash dividends declared per share $ 0.66 $ 0.66 $ 0.66