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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net income $ 2,341,000 $ 2,842,000 $ 4,976,000 $ 5,111,000
Interest rate swaps:        
Adjustment for amortization of losses included in net income 21,000 20,000 41,000 41,000
Income tax expense (7,000) (7,000) (14,000) (14,000)
Post retirement benefit plan adjustments:        
Net actuarial loss 40,000 55,000 79,000 110,000
Prior service costs (124,000) (124,000) (248,000) (248,000)
Income tax benefit 32,000 20,000 64,000 41,000
Comprehensive income $ 2,303,000 $ 2,806,000 $ 4,898,000 $ 5,041,000