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Other Comprehensive Income (Loss) (Other Comprehensive Income (Loss) Components And Related Taxes) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011
Other Comprehensive Income (Loss) [Abstract] |  |
Change in pension plan assets and benefit obligations, Before-tax amount | $ 634 |
Change in pension plan assets and benefit obligations, Tax effect | 222 |
Change in pension plan assets and benefit obligations, Net-of-tax amount | 412 |
Unrealized gains (losses) on available-for-sale securities, Before-tax amount | (3,390) | (3,166)
Unrealized gains (losses) on available-for-sale securities, Tax effect | (1,188) | (1,108)
Unrealized gains (losses) on available-for-sale securities, Net-of-tax amount | (2,202) | (2,058)
Reclassification adjustment for gains realized in net income, Before-tax amount |  | (6,635)
Reclassification adjustment for gains realized in net income, Tax effect |  | (2,322)
Reclassification adjustment for gains realized in net income, Net-of-tax amount |  | (4,313)
Unrealized net holding gain (loss) on cash flow hedge, Before-tax amount | 173 | 204
Unrealized net holding gain (loss) on cash flow hedge, Tax effect | 60 | 71
Unrealized net holding gain (loss) on cash flow hedge, Net-of-tax amount | 113 | 133
Other comprehensive income (loss), Before-tax amount | (2,583) | (9,597)
Other comprehensive income (loss), Tax effect | (906) | (3,359)
Other comprehensive loss | $ (1,677) | $ (6,238)

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