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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Income Statement [Abstract]    
Net unrealized holding gain on available-for-sale securities arising during the period, tax $ (305) $ 708
Reclassification adjustment for net realized gain on sale included in of available-for-sale securities tax (1) (38)
Net retirement plan gain, tax $ 200 $ 183