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Restrictions On Cash And Due From Banks	12 Months Ended
Restrictions On Cash And Due From Banks	Dec. 31, 2010
Restrictions On Cash And Due From Banks [Abstract]
Restrictions on Cash and Due from Banks	3. RESTRICTIONS ON CASH AND DUE FROM BANKS The Corporation's two bank subsidiaries are required to maintain average reserve balances with the Federal Reserve Bank. The average required reserve balance was approximately $37.8 million at December 31, 2010 and $31.9 million at December 31, 2009. No other compensating balance arrangements were in existence at December 31, 2010.