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Restrictions On Cash And Due From Bank Accounts	12 Months Ended
Restrictions On Cash And Due From Bank Accounts	Dec. 31, 2011
Restrictions On Cash And Due From Bank Accounts [Abstract]
Restrictions On Cash And Due From Bank Accounts	NOTE 4. RESTRICTIONS ON CASH AND DUE FROM BANK ACCOUNTS The Board of Governors of the Federal Reserve System, or the Federal Reserve, imposes certain reserve requirements on all depository institutions. These reserves are maintained in the form of vault cash or as an interest-bearing balance with the Federal Reserve. During the years ended 2011, 2010 and 2009 the required reserves averaged $36.6 million, $32.5 million and $27.2 million, respectively.