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Other Comprehensive Income (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Summary of change in accumulated other comprehensive income (loss)        
Unrealized gains (losses) on securities available for sale, Beginning Balance $ 12,478 $ (1,963) $ (4,517)  
Unrealized gains (losses) on securities available for sale 3,561 14,441 2,554  
Unrealized gains (losses) on securities available for sale, Ending Balance 16,039 12,478 (1,963)  
Unrealized gain (loss) on postretirement benefits plan, Beginning Balance (632) (147) 98  
Unrealized gain (loss) on postretirement benefits plan (349) (485) (245)  
Unrealized gain (loss) on postretirement benefits plan, Ending Balance (981) (632) (147)  
Unrealized gain (loss) on interest rate swap, Beginning Balance (1,085) (563) (456)  
Unrealized gain (loss) on interest rate swap (49) (522) (107)  
Unrealized gain (loss) on interest rate swap Ending Balance (1,134) (1,085) (563)  
Total 13,924 10,761 (2,673) (4,875)
Unrealized gain (loss), net of increase (decrease) $ 3,163 $ 13,434 $ 2,202