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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net income $ 1,681,000 $ 2,635,000
Interest rate swaps:    
Adjustment for amortization of losses included in net income 21,000 20,000
Income tax expense (7,000) (7,000)
Post retirement benefit plan adjustments:    
Net actuarial loss 50,000 39,000
Prior service costs (124,000) (124,000)
Income tax benefit 21,000 32,000
Comprehensive income $ 1,642,000 $ 2,595,000