5. Loans, Allowance for Loan Losses and Credit Quality (Details 6) (Commercial and industrial, USD $)	9 Months Ended
Sep. 30, 2012 integer
Commercial and industrial
Number of TDRs contracts which subsequently default	1
Recorded Investment	$ 158,076

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953682-111524

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration