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Note 7 - Loans And Related Allowance For Loan Losses (Detail) - Impaired Loans by Class (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
With no related allowance recorded: |  |
Impaired loans with no related allowance recorded investment | $ 7,992 | $ 8,408
Impaired loans with no related allowance unpaid principal balance | 8,105 | 8,441
With an allowance recorded: |  |
Impaired loans with related allowance recorded investment | 11,247 | 12,880
Impaired loans with related allowance unpaid principal balance | 11,286 | 12,899
Impaired loans, related allowance | 2,876 | 3,688
Total: |  |
Impaired loans recorded investment | 19,239 | 21,288
Impaired loans unpaid principal balance | 19,391 | 21,340
Impaired loans, related allowance | 2,876 | 3,688
Commercial and Industrial [Member] |  |
With no related allowance recorded: |  |
Impaired loans with no related allowance recorded investment | 1,271 | 1,230
Impaired loans with no related allowance unpaid principal balance | 1,271 | 1,229
With an allowance recorded: |  |
Impaired loans with related allowance recorded investment | 1,704 |
Impaired loans with related allowance unpaid principal balance | 1,704 |
Impaired loans, related allowance | 700 | 1,189
Total: |  |
Impaired loans recorded investment | 2,975 | 4,592
Impaired loans unpaid principal balance | 2,975 | 4,596
Impaired loans, related allowance | 700 | 1,189
Real Estate Construction [Member] |  |
With no related allowance recorded: |  |
Impaired loans with no related allowance recorded investment | 322 | 308
Impaired loans with no related allowance unpaid principal balance | 322 | 308
With an allowance recorded: |  |
Impaired loans with related allowance recorded investment | 3,450 | 3,685
Impaired loans with related allowance unpaid principal balance | 3,450 | 3,685
Impaired loans, related allowance | 790 | 933
Total: |  |
Impaired loans recorded investment | 3,772 | 3,993
Impaired loans unpaid principal balance | 3,772 | 3,993
Impaired loans, related allowance | 790 | 933
Residential Real Estate Mortgage [Member] |  |
With no related allowance recorded: |  |
Impaired loans with no related allowance recorded investment | 2,617 | 2,716
Impaired loans with no related allowance unpaid principal balance | 2,730 | 2,729
With an allowance recorded: |  |
Impaired loans with related allowance recorded investment | 3,025 | 3,045
Impaired loans with related allowance unpaid principal balance | 3,064 | 3,054
Impaired loans, related allowance | 703 | 600
Total: |  |
Impaired loans recorded investment | 5,642 | 5,761
Impaired loans unpaid principal balance | 5,794 | 5,783
Impaired loans, related allowance | 703 | 600
Commercial Real Estate Mortgage [Member] |  |
With no related allowance recorded: |  |
Impaired loans with no related allowance recorded investment | 3,772 | 4,143
Impaired loans with no related allowance unpaid principal balance | 3,772 | 4,164
With an allowance recorded: |  |
Impaired loans with related allowance recorded investment | 3,060 | 2,771
Impaired loans with related allowance unpaid principal balance | 3,060 | 2,776
Impaired loans, related allowance | 682 | 960
Total: |  |
Impaired loans recorded investment | 6,832 | 6,914
Impaired loans unpaid principal balance | 6,832 | 6,940
Impaired loans, related allowance | 682 | 960
Consumer Installment [Member] |  |
With no related allowance recorded: |  |
Impaired loans with no related allowance recorded investment | 10 | 11
Impaired loans with no related allowance unpaid principal balance | 10 | 11
With an allowance recorded: |  |
Impaired loans with related allowance recorded investment | 8 | 17
Impaired loans with related allowance unpaid principal balance | 8 | 17
Impaired loans, related allowance | 1 | 6
Total: |  |
Impaired loans recorded investment | 18 | 28
Impaired loans unpaid principal balance | 18 | 28
Impaired loans, related allowance | 1 | 6
Commercial and Industrial [Member] |  |
With an allowance recorded: |  |
Impaired loans with related allowance recorded investment |  | 3,362
Impaired loans with related allowance unpaid principal balance |  | 3,367
Impaired loans, related allowance |  | 1,189
Total: |  |
Impaired loans, related allowance |  | $ 1,189

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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524 + Details
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