Short-Term Borrowings (Details Textual)	12 Months Ended
Dec. 31, 2012
Short-Term Borrowings (Textual) [Abstract]
Repurchase agreements original maturity description	less than one year

This describes the time frame of the terms of the entity's repurchase agreements.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(m)(1)(i)(A))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Name:	us-gaap_RepurchaseAgreementsMaturities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration