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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Net income $ 1,589,000 $ 2,341,000 $ 3,270,000 $ 4,976,000
Interest rate swaps:        
Adjustment for amortization of losses included in net income 4,000 21,000 25,000 41,000
Income tax expense (2,000) (7,000) (9,000) (14,000)
Post retirement benefit plan adjustments:        
Net actuarial loss 51,000 40,000 101,000 79,000
Prior service costs (124,000) (124,000) (248,000) (248,000)
Income tax benefit 22,000 32,000 43,000 64,000
Comprehensive income $ 1,540,000 $ 2,303,000 $ 3,182,000 $ 4,898,000