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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]      
Net income $ 6,550 $ 4,322 $ 3,605
Other comprehensive income:      
Changes in benefit obligations and plan assets for defined benefit and post retirement benefit plans, net of deferred income taxes of ($4), $146, and $141 for the years ended December 31, 2012, 2011, and 2012, respectively (7) 275 275
Unrealized gain on available for sale securities, net of deferred income taxes of $289, $885, and $60 for the year ended December 31, 2012 , 2011 and 2010, respectively 560 1,717 116
Change in market value of interest rate swap, net of deferred income taxes of ($19), ($140), and ($140) for the years ended December 31, 2012, 2011 and 2010, respectively (36) (271) (273)
Total other comprehensive income 517 1,721 118
Total comprehensive income $ 7,067 $ 6,043 $ 3,723