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Consolidated Statements of Changes In Stockholders' Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Unrealized net holding gain (loss) on cash flow hedge, tax | $ 296 | $ 276 | $ (53)
Unrealized net holding gain on securities-available-for-sale, tax | (1,645) | (1,318) | (8,078)
Cash dividends on common stock per share | $ 3.76 | $ 3.76 | $ 3.76
Change in funded status of pension plan, tax | $ (3,328) | $ (2,707) | $ (1,307)

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