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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income $ 7,786 $ 6,370 $ 6,897
Other comprehensive income (loss):      
Changes in benefit obligations and plan assets for post retirement benefit plans, net of reclassification adjustments, net of deferred income tax of ($1), $0 and $0 for the years ended December 31, 2017, 2016, and 2015, respectively (2) 0 0
Unrealized gain (loss) on available for sale securities, net of reclassification adjustments, net of deferred income tax of $147, ($554), and ($234) for the years ended December 31, 2017, 2016, and 2015, respectively 285 (1,075) (454)
Change in fair value of interest rate swap, net of deferred income tax of $0, $0, and $99 for the years ended December 31, 2017, 2016 and 2015, respectively 0 0 190
Total other comprehensive income (loss) 283 (1,075) (264)
Total comprehensive income $ 8,069 $ 5,295 $ 6,633