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Deposits - Time Certificate Denominations and Overdrawn Accounts (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Deposits    
Time certificates of deposit in denominations of $250,000 or more, in the aggregate   $ 2,600.0
Overdrawn deposit accounts classified as loans $ 1.7 $ 3.0