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Note 6 - Loans And Related Allowance For Loan Losses (Detail) - Additional Information Regarding Troubled Debt Restructurings (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Rate Forgiveness [Member] | Commercial and Industrial [Member] | Nine Months [Member]
Number of Contracts	1
Rate Forgiveness [Member] | Residential Real Estate Mortgage [Member] | Three Months [Member]
Number of Contracts	1
Rate Forgiveness [Member] | Residential Real Estate Mortgage [Member] | Nine Months [Member]
Number of Contracts	2
Other Modifications [Member] | Commercial and Industrial [Member] | Three Months [Member]
Number of Contracts	2
Other Modifications [Member] | Commercial and Industrial [Member] | Nine Months [Member]
Number of Contracts	8
Other Modifications [Member] | Residential Real Estate Mortgage [Member] | Three Months [Member]
Number of Contracts	6
Other Modifications [Member] | Residential Real Estate Mortgage [Member] | Nine Months [Member]
Number of Contracts	8
Other Modifications [Member] | Consumer Installment [Member] | Three Months [Member]
Number of Contracts	1
Other Modifications [Member] | Consumer Installment [Member] | Nine Months [Member]
Number of Contracts	2
Commercial and Industrial [Member] | Three Months [Member]
Number of Contracts	2
Pre-Modification Outstanding Recorded Investment (in Dollars)	13
Commercial and Industrial [Member] | Nine Months [Member]
Number of Contracts	9
Pre-Modification Outstanding Recorded Investment (in Dollars)	243
Residential Real Estate Mortgage [Member] | Three Months [Member]
Number of Contracts	7
Pre-Modification Outstanding Recorded Investment (in Dollars)	619
Residential Real Estate Mortgage [Member] | Nine Months [Member]
Number of Contracts	10
Pre-Modification Outstanding Recorded Investment (in Dollars)	946
Consumer Installment [Member] | Three Months [Member]
Number of Contracts	1
Pre-Modification Outstanding Recorded Investment (in Dollars)	6
Consumer Installment [Member] | Nine Months [Member]
Number of Contracts	2
Pre-Modification Outstanding Recorded Investment (in Dollars)	11

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of investment in financing receivables (before modification) modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant