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Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Components of accumulated Other Comprehensive Income    
Net unrealized gain on securities available for sale $ 27,603 $ 25,101
Accumulated loss on effective cash flow hedging derivatives (3,863) (3,596)
Net unrecognized pension cost (534) (601)
Total $ 23,206 $ 20,904