Derivatives and Hedging Activities (Details Textual) (USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2014	Sep. 30, 2014 Government Agency Issued Bonds or MBS	Dec. 31, 2013 Government Agency Issued Bonds or MBS	Sep. 30, 2013 Government Agency Issued Bonds or MBS
Derivative [Line Items]
Term of written loan commitments, days	60
Remaining Term on Swap Participation Agreements, minimum	3 years
Default Assumptions Percentage	100.00%
Collateral posted against derivative liabilities		$ 55.0	$ 70.5	$ 78.2
Credit Derivative, Maximum Exposure, Undiscounted	$ 4.2

Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4K

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5708775-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Credit Derivative

-URI http://asc.fasb.org/extlink&oid=6854095

Name:	us-gaap_CreditDerivativeMaximumExposureUndiscounted
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant