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 Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]          
Available For Sale Securities Transferred To Held To Maturity Securities $ 1,000,000   $ 992,760 $ 0  
Pledged investment securities to secure public and trust deposits, trading account liabilities, US Treasury demand notes and security repurchase agreements 6,200,000   6,200,000   $ 5,000,000
Unrealized Net Losses Recognized In Oci At Time Of Transfer Of Available For Sale Securities Transferred To Held To Maturity Securities 13,500        
Nonmarketable equity securities          
Schedule of Available-for-sale Securities [Line Items]          
Stock issued by Federal Reserve Banks included in other securities 296,000   296,000   299,000
Federal Home Loan Bank of Cincinnati | Nonmarketable equity securities          
Schedule of Available-for-sale Securities [Line Items]          
Stock issued by the Federal Home Loan Bank included in other securities 287,000   287,000   $ 249,000
Commercial          
Schedule of Available-for-sale Securities [Line Items]          
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset $ 3,000 $ 2,000 $ 8,000 $ 7,000