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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Net income $ 2,635,000 $ 2,269,000
Interest rate swaps:    
Adjustment for amortization of losses included in net income 20,000 21,000
Income tax expense (7,000) (7,000)
Post retirement benefit plan adjustments:    
Net actuarial loss 39,000 55,000
Prior service cost (124,000) (124,000)
Income tax benefit 32,000 21,000
Comprehensive income $ 2,595,000 $ 2,235,000