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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net income $ 2,890,000 $ 3,196,000
Derivative [Member]    
Interest rate swaps:    
Adjustment for amortization of losses included in net income 5,000 5,000
Income tax expense 2,000 2,000
Other Postretirement Benefit Plans, Defined Benefit [Member]    
Post retirement benefit plan adjustments:    
Net actuarial loss 39,000 42,000
Prior service costs (124,000) (124,000)
Income tax benefit 26,000 25,000
Comprehensive Income [Member]    
Post retirement benefit plan adjustments:    
Comprehensive income $ 2,834,000 $ 3,142,000