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Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Consolidated Statements Of Comprehensive Income [Abstract]    
Unrealized gain on available for sale securities, deferred income taxes $ 87 $ 42
Change in market value of interest rate swap, deferred income taxes $ 7 $ 21