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Note 4 - Loans And Related Allowance For Loan Losses (Detail) - Troubled Debt Restructurings That Subsequently Defaulted (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Commercial and Industrial [Member] |  |  |
Number of Contracts | 6 | 3 | 2
Recorded Investment (in Dollars) | $ 256 | $ 134 | $ 174
Real Estate Construction [Member] |  |  |
Number of Contracts | 1 | 0 |
Recorded Investment (in Dollars) | 3,622 | 0 |
Residential Real Estate Mortgage [Member] |  |  |
Number of Contracts | 2 | 0 | 3
Recorded Investment (in Dollars) | 89 | 0 | 203
Commercial Real Estate Mortgage [Member] |  |  |
Number of Contracts | 0 |  | 0
Recorded Investment (in Dollars) | 0 |  | 0
Consumer Installment [Member] |  |  |
Number of Contracts | 1 | 2 | 0
Recorded Investment (in Dollars) | $ 5 | $ 28 | $ 0

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- 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