Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $) In Thousands, except Per 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]
Change in unrealized gains on securities available for sale, tax	$ 4,068	$ (723)	$ 366
Reclassification adjustment for gains on securities available for sale,tax	0	(55)	(1)
Reclassification adjustment for losses on impairment of securities, tax	0	11	0
Change in unfunded pension liability, tax	$ (305)	$ 84	$ 968
Cash dividends declared (in dollars per share)	$ 0.92	$ 0.92	$ 0.92

The tax effect of the amount of the change in the additional minimum pension liability not yet recognized pursuant to FAS 87 as a net periodic pension cost. If the additional pension liability required to be recognized exceeds the unrecognized prior service costs, then the excess (which is the net loss not yet recognized as net periodic pension cost) is to be recorded as a separate component in other comprehensive income, before adjusting for tax effects. In a subsequent measurement, the elimination or adjustment to the amount of the minimum pension liability recorded in accumulated other comprehensive income is included in this line. Eliminated upon adoption of FAS 158.

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Tax effect on the reclassification adjustment for gains or losses realized upon the sale of securities during the period.

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- Definition

Tax effect on the reclassification adjustment for losses realized upon the write-down of securities.

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- Definition

Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.

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