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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
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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

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- 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

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- 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