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Consolidated Statements of Comprehensive Income - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Comprehensive Income [Abstract]      
Net income $ 12,050,000 $ 9,634,000 $ 6,866,000
Interest rate swaps:      
Adjustment for amortization of losses included in net income 21,000 21,000 36,000
Income tax expense 8,000 7,000 12,000
Post retirement benefit plan adjustments:      
Net actuarial (loss) gain 217,000 (2,679,000) 3,118,000
Prior service costs (496,000) (496,000) (496,000)
Income tax benefit (expense) 81,000 1,119,000 (961,000)
Comprehensive income $ 11,865,000 $ 7,592,000 $ 8,551,000