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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Jun. 27, 2015
Jun. 28, 2014
Consolidated Statements of Comprehensive Income [Abstract]        
Unrealized holding gains (losses) arising during period, deferred taxes $ 88 $ 162 $ 76 $ 819
Reclassification adjustment for gains included in net income, deferred taxes $ 4 $ 2 $ 7 $ 20