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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]    
Unrealized gain on available for sale securities, deferred income taxes $ (143) $ 87
Change in market value of interest rate swap, deferred income taxes $ 17 $ 7