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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
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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

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- 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