COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Credit Extensions
Allowance for unfunded loan commitments, off-balance sheet credit exposures and recourse provision	$ 11.0	$ 10.0
Undisbursed Loan Commitments
Credit Extensions
Loan	2,190.0	1,890.0
Mortgage and commercial loan applications in process
Credit Extensions
Loan	305.6	349.9
Commercial and Standby Letters of Credit
Credit Extensions
Commercial and standby letters of credit issued	$ 1,640.0	$ 768.8