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Note 6 - Loans And Related Allowance For Loan Losses (Detail) - Troubled Debt Restructurings (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Commercial and Industrial [Member] | Three Months [Member]
Troubled Debt Restructurings subsequently defaulted - number of contracts	1
Troubled Debt Restructurings subsequently defaulted - recorded investment (in Dollars)	$ 30
Commercial and Industrial [Member] | Nine Months [Member]
Troubled Debt Restructurings subsequently defaulted - number of contracts	2
Troubled Debt Restructurings subsequently defaulted - recorded investment (in Dollars)	60
Residential Real Estate Mortgage [Member] | Three Months [Member]
Troubled Debt Restructurings subsequently defaulted - number of contracts	1
Troubled Debt Restructurings subsequently defaulted - recorded investment (in Dollars)	20
Residential Real Estate Mortgage [Member] | Nine Months [Member]
Troubled Debt Restructurings subsequently defaulted - number of contracts	1
Troubled Debt Restructurings subsequently defaulted - recorded investment (in Dollars)	$ 20

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

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=7512638&loc=SL6953682-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

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

+ References

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=7512638&loc=SL6953682-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant