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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) (USD $) | 9 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011
Consolidated Statements of Changes in Shareholders' Equity (Unaudited) [Abstract] |  |
Net unrealized gain on securities available for sale, taxes | $ 5,500,000 | $ 1,124,000
Unrecognized transition obligation for postretirement benefits, taxes | $ 8,000 | $ 8,000

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