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Note 4 - Loans And Related Allowance For Loan Losses (Detail) - Impaired Loans by Class (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Impaired loans with no related allowance recorded investment | $ 8,408 | $ 11,162
Impaired loans with no related allowance unpaid principal balance | 8,441 | 11,175
Impaired loans with related allowance recorded investment | 12,880 | 3,291
Impaired loans with related allowance unpaid principal balance | 12,899 | 3,296
Impaired loans, related allowance | 3,688 | 872
Impaired loans recorded investment | 21,288 | 14,453
Impaired loans unpaid principal balance | 21,340 | 14,471
Commercial and Industrial [Member] |  |
Impaired loans with no related allowance recorded investment | 1,230 | 1,172
Impaired loans with no related allowance unpaid principal balance | 1,229 | 1,172
Impaired loans with related allowance recorded investment |  | 465
Impaired loans with related allowance unpaid principal balance |  | 465
Impaired loans, related allowance | 1,189 | 196
Impaired loans recorded investment | 4,592 | 1,637
Impaired loans unpaid principal balance | 4,596 | 1,637
Real Estate Construction [Member] |  |
Impaired loans with no related allowance recorded investment | 308 | 4,250
Impaired loans with no related allowance unpaid principal balance | 308 | 4,250
Impaired loans with related allowance recorded investment | 3,685 | 271
Impaired loans with related allowance unpaid principal balance | 3,685 | 271
Impaired loans, related allowance | 933 | 125
Impaired loans recorded investment | 3,993 | 4,521
Impaired loans unpaid principal balance | 3,993 | 4,521
Residential Real Estate Mortgage [Member] |  |
Impaired loans with no related allowance recorded investment | 2,716 | 3,188
Impaired loans with no related allowance unpaid principal balance | 2,729 | 3,193
Impaired loans with related allowance recorded investment | 3,045 | 0
Impaired loans with related allowance unpaid principal balance | 3,054 | 0
Impaired loans, related allowance | 600 | 0
Impaired loans recorded investment | 5,761 | 3,188
Impaired loans unpaid principal balance | 5,783 | 3,193
Commercial Real Estate Mortgage [Member] |  |
Impaired loans with no related allowance recorded investment | 4,143 | 2,528
Impaired loans with no related allowance unpaid principal balance | 4,164 | 2,536
Impaired loans with related allowance recorded investment | 2,771 | 2,555
Impaired loans with related allowance unpaid principal balance | 2,776 | 2,560
Impaired loans, related allowance | 960 | 551
Impaired loans recorded investment | 6,914 | 5,083
Impaired loans unpaid principal balance | 6,940 | 5,096
Consumer Installment [Member] |  |
Impaired loans with no related allowance recorded investment | 11 | 24
Impaired loans with no related allowance unpaid principal balance | 11 | 24
Impaired loans with related allowance recorded investment | 17 |
Impaired loans with related allowance unpaid principal balance | 17 |
Impaired loans, related allowance | 6 |
Impaired loans recorded investment | 28 | 24
Impaired loans unpaid principal balance | 28 | 24
Commercial and Industrial [Member] |  |
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 |

X
- 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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- 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 Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without 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 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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