Derivatives and Hedging Activities (Details Textual) (USD $) In Millions, unless otherwise specified	6 Months Ended				6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Government Agency Issued Bonds or MBS	Dec. 31, 2013 Government Agency Issued Bonds or MBS	Jun. 30, 2013 Government Agency Issued Bonds or MBS	Jun. 30, 2014 Credit Default Swap, Selling Protection [Member]
Derivative [Line Items]
Term of written loan commitments, days	60
Default Assumptions Percentage	100.00%
Maximum value of the guaranteed derivative instruments	$ 3.2
Collateral posted against derivative liabilities		$ 64.0	$ 70.5	$ 82.2
Remaining Term on Swap Participation Agreements, minimum	3 years				1 year
Remaining term on swap participation agreements, maximum	9 years				8 years