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Note 4 - Loans And Related Allowance For Loan Losses (Detail) - Troubled Debt Restructurings (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Rate Forgiveness [Member] | Commercial and Industrial [Member] |  |  |
Number of contracts | 1 | 0 | 0
Rate Forgiveness [Member] | Real Estate Construction [Member] |  |  |
Number of contracts |  | 0 |
Rate Forgiveness [Member] | Residential Real Estate Mortgage [Member] |  |  |
Number of contracts | 2 | 0 | 0
Rate Forgiveness [Member] | Commercial Real Estate Mortgage [Member] |  |  |
Number of contracts |  | 0 | 0
Rate Forgiveness [Member] | Consumer Installment [Member] |  |  |
Number of contracts | 0 | 0 | 0
Other Restructurings [Member] | Commercial and Industrial [Member] |  |  |
Number of contracts | 12 | 8 | 7
Other Restructurings [Member] | Real Estate Construction [Member] |  |  |
Number of contracts |  | 2 |
Other Restructurings [Member] | Residential Real Estate Mortgage [Member] |  |  |
Number of contracts | 7 | 10 | 8
Other Restructurings [Member] | Commercial Real Estate Mortgage [Member] |  |  |
Number of contracts | 1 | 2 | 3
Other Restructurings [Member] | Consumer Installment [Member] |  |  |
Number of contracts | 2 | 2 | 3
Commercial and Industrial [Member] |  |  |
Number of contracts | 13 | 8 | 7
Pre-modification outstanding recorded investment (in Dollars) | 489 | 586 | 668
Real Estate Construction [Member] |  |  |
Number of contracts |  | 2 |
Pre-modification outstanding recorded investment (in Dollars) |  | 3,883 |
Residential Real Estate Mortgage [Member] |  |  |
Number of contracts | 9 | 10 | 8
Pre-modification outstanding recorded investment (in Dollars) | 921 | 1,639 | 1,230
Commercial Real Estate Mortgage [Member] |  |  |
Number of contracts | 1 | 2 | 3
Pre-modification outstanding recorded investment (in Dollars) | 156 | 1,625 | 2,025
Consumer Installment [Member] |  |  |
Number of contracts | 2 | 2 | 3
Pre-modification outstanding recorded investment (in Dollars) | 11 | 24 | 43

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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