Derivatives and Hedging Activities (Details Textual) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 Government Agency Issued Bonds or MBS	Dec. 31, 2012 Government Agency Issued Bonds or MBS	Sep. 30, 2012 Government Agency Issued Bonds or MBS
Derivative [Line Items]
Term of written loan commitments, days	60
Default Assumptions Percentage	100.00%
Maximum value of the guaranteed derivative instruments	$ 3.3
Collateral posted against derivative liabilities		$ 78.2	$ 96.5	$ 103.0
Remaining Term on Swap Participation Agreements, Min	1 year
Remaining Term on Swap Participation Agreements, Max	6 years