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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Statement of Other Comprehensive Income [Abstract]        
Unrealized gain on available for sale securities, deferred income taxes $ 200 $ 467 $ 287 $ 509
Change in market value of interest rate swap, deferred income taxes $ 25 $ 59 $ 18 $ 38