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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Net income $ 2,520,000 $ 1,589,000 $ 4,640,000 $ 3,270,000
Interest rate swaps:        
Adjustment for amortization of losses included in net income 5,000 4,000 10,000 25,000
Income tax expense 2,000 2,000 4,000 9,000
Post retirement benefit plan adjustments:        
Net actuarial loss 12,000 51,000 24,000 101,000
Prior service costs (124,000) (124,000) (248,000) (248,000)
Income tax benefit 35,000 22,000 70,000 43,000
Comprehensive income $ 2,446,000 $ 1,540,000 $ 4,492,000 $ 3,182,000