Cash and Due from Banks and Interest Bearing Deposits (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Cash and Cash Equivalents [Line Items]
Balance requirements	$ 74.1	$ 69.4
Federal Reserve [Member]
Cash and Cash Equivalents [Line Items]
Cash accounts which exceeded federally insured limits	93.4
Fifth Third Bank [Member]
Cash and Cash Equivalents [Line Items]
Cash accounts which exceeded federally insured limits	23.3
Federal Home Loan Bank [Member]
Cash and Cash Equivalents [Line Items]
Cash accounts which exceeded federally insured limits	$ 2.2