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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net income     $ 4,350,000 $ 7,235,000
Comprehensive Income [Member]        
Net income $ 1,460,000 $ 4,039,000 4,350,000 7,235,000
Interest rate swaps:        
Adjustment for amortization of losses included in net income 0 6,000 5,000 11,000
Income tax expense 0 2,000 2,000 4,000
Post retirement benefit plan adjustments:        
Net actuarial loss 39,000 42,000 78,000 84,000
Prior service costs (124,000) (124,000) (248,000) (248,000)
Income tax benefit 25,000 24,000 51,000 49,000
Comprehensive income $ 1,400,000 $ 3,985,000 $ 4,234,000 $ 7,127,000