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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net income $ 1,151,000 $ 2,856,000 $ 6,127,000 $ 7,967,000
Interest rate swaps:        
Adjustment for amortization of losses included in net income 21,000 21,000 62,000 62,000
Income tax expense (7,000) (7,000) (21,000) (21,000)
Post retirement benefit plan adjustments:        
Net actuarial loss 40,000 54,000 119,000 164,000
Prior service costs (124,000) (124,000) (372,000) (372,000)
Income tax benefit 32,000 21,000 96,000 62,000
Comprehensive income $ 1,113,000 $ 2,821,000 $ 6,011,000 $ 7,862,000