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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

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