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Federal funds sold	12 Months Ended
Federal funds sold	Dec. 31, 2011
Federal funds sold [Abstract]
Federal funds sold	Federal funds sold Federal funds sold averaged $32.6 million during 2011 and $29.5 million in 2010, while the maximum balance outstanding at any month-end during 2011, 2010 and 2009 was $44.3 million, $49.8 million and $70.5 million, respectively.