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Note 4 - Loans and Allowance for Loan Losses (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2012 Troubled Debt Restructurings [Member] | Sep. 30, 2012 Troubled Debt Restructurings [Member] | Dec. 31, 2011 Troubled Debt Restructurings [Member] | Sep. 30, 2012 Commercial and Industrial [Member] | Dec. 31, 2011 Troubled Debt Restructurings Performing According to Modified Terms [Member] | Sep. 30, 2012 Unsecured [Member] | Dec. 31, 2011 Unsecured [Member]
Increase (Decrease) in Other Loans |  |  |  | $ 2,803,000 |  |  |  |  |
Change in Troubled Debt Restructurings |  | 30.00% |  |  |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts |  |  |  |  |  | 1 |  |  |
Financing Receivable, Allowance for Credit Losses, Write-downs |  |  | 4,244,000 |  |  |  |  |  |
Percentage of Loan Portfolio | 78.00% |  |  |  |  |  | 97.00% | 4.20% | 3.98%
Impaired Financing Receivable, Related Allowance | 2,078,000 | 655,000 | 2,206,000 | 2,206,000 | 655,000 |  |  |  |
Other Commitment | 101 | 81 |  |  |  |  |  |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 676 |  |  |  |  |  |  |  |
Minimum Loan Balance for Loans Evaluated by Risk Categories | $ 500 |  |  |  |  |  |  |  |

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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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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
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18845-111554 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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- Definition The increase (decrease) during the reporting period in loans that are classified as working capital and are not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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