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Premises and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Summary of premises and equipment    
Premises $ 22,992 $ 20,975
Furniture and equipment 24,874 24,340
Premises and equipment, gross 47,866 45,315
Less: Accumulated depreciation (30,378) (29,562)
Premises and equipment less depreciation, gross 17,488 15,753
Land and land improvements 5,107 4,140
Total $ 22,595 $ 19,893