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Accumulated Other Comprehensive Income (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Tax effect $ 1,111 $ (28)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax (1,667) 42
Change in funded status of post retirement benefits 357 617
Tax effect (143) (247)
Amounts reclassified from accumulated other comprehensive income 212 44
Amount Reclassified From Accumulated Other Comprehensive Income [Member]
    
Unrealized gains and losses 4 (4)
Tax effect (2) 2
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax 2 (2)
Change in funded status of post retirement benefits (357) [1] (70) [1]
Tax effect 143 28
Amounts reclassified from accumulated other comprehensive income, Retirement plans (214) (42)
Amounts reclassified from accumulated other comprehensive income $ (212) $ (44)
[1] Included in the computation of net periodic benefit cost. (see Footnoe 7 for additional details).