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Accumulated Other Comprehensive Income (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Unrealized gains (losses) on securities available-for-sale without other than temporary impairment $ 15,161 $ 18,503 $ 17,044 $ 18,136
Unrealized gains (losses) on securities available-for-sale with other than temporary impairment (3,397) (5,393) (3,613) (5,396)
Total unrealized loss on securities available-for-sale 11,764 13,110 13,431 12,740
Unrealized loss on retirement plans (20,689) (23,192) (20,903) (23,234)
TOTAL (8,925) (10,082) (7,472) (10,494)
Unrealized gains (losses) on securities available-for-sale without other than temporary impairment, Current Period Change (1,883) 367    
Unrealized gains (losses) on securities available-for-sale with other than temporary impairment, Current Period Change 216 3    
Total unrealized loss on securities available-for-sale, Current Period Change (1,667) 370    
Unrealized loss on retirement plans, Current Period Change 214 42    
TOTAL, Current Period Change $ (1,453) $ 412