Quarterly report pursuant to Section 13 or 15(d)

AVAILABLE-FOR-SALE AND OTHER SECURITIES - Narrative (Details)

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AVAILABLE-FOR-SALE AND OTHER SECURITIES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]          
Pledged investment securities to secure public and trust deposits, trading account liabilities, US Treasury demand notes and security repurchase agreements $ 2,500.0   $ 2,500.0    
Non-marketable equity securities          
Schedule of Available-for-sale Securities [Line Items]          
Stock issued by Federal Reserve Banks included in other securities 177.0   177.0   $ 176.0
Federal Home Loan Bank of Cincinnati [Member] | Non-marketable equity securities          
Schedule of Available-for-sale Securities [Line Items]          
Stock issued by the Federal Home Loan Bank included in other securities 157.0   157.0   $ 157.0
Commercial          
Schedule of Available-for-sale Securities [Line Items]          
Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets $ 2.0 $ 2.0 $ 4.5 $ 4.1