Deposits (Details Textual) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Domestic Deposits, Brokered [Line Items]
Deposits Exceeding FDIC Insurance Limit of $250,000	$ 769.0	$ 858.0
Deposits FDIC Insured $250,000 and Under	1,400.0	3,300.0
Time Deposits Balance [Domain]
Domestic Deposits, Brokered [Line Items]
Interest-bearing Domestic Deposit, Brokered	405.5	272.5
Non-maturity Deposits [Member]
Domestic Deposits, Brokered [Line Items]
Interest-bearing Domestic Deposit, Brokered	$ 1,200.0	$ 942.3