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Note 3 - Loans and Allowance for Loan Losses (Detail) - Loans Individually Evaluated for Impairment (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
With related allowance recorded recorded investment | $ 1,979,000 |
With related allowance recorded allowance for loan losses allocated | 1,979 | 655
Individually Evaluated for Impairment [Member] | Residential Real Estate Loans [Member] |  |
With no related allowance recorded unpaid principal balance | 619,000 | 1,136,000
With no related allowance recorded recorded investment | 407,000 | 1,085,000
With no related allowance recorded interest income recognized |  | 36,000
With no related allowance recorded cash basis interest recognized |  | 31,000
With no related allowance recorded average impaired loans | 493,000 | 748,000
With related allowance recorded unpaid principal balance | 420,000 | 2,396,000
With related allowance recorded recorded investment | 420,000 | 2,396,000
With related allowance recorded allowance for loan losses allocated | 128,000 | 437,000
With related allowance recorded interest income recognized | 23,000 | 128,000
With related allowance recorded cash basis interest recognized | 23,000 | 118,000
With related allowance recorded average impaired loans | 420,000 | 2,414,000
Individually Evaluated for Impairment [Member] | Commercial Real Estate Owner Occupied [Member] |  |
With no related allowance recorded unpaid principal balance | 5,528,000 | 2,774,000
With no related allowance recorded recorded investment | 5,528,000 | 2,531,000
With no related allowance recorded interest income recognized | 338,000 | 207,000
With no related allowance recorded cash basis interest recognized | 338,000 | 309,000
With no related allowance recorded average impaired loans | 4,729,000 | 2,418,000
Individually Evaluated for Impairment [Member] | Commercial Real Estate Nonowner Occupied [Member] |  |
With no related allowance recorded unpaid principal balance | 10,085,000 | 4,131,000
With no related allowance recorded recorded investment | 8,847,000 | 4,131,000
With no related allowance recorded interest income recognized | 456,000 | 174,000
With no related allowance recorded cash basis interest recognized | 456,000 | 57,000
With no related allowance recorded average impaired loans | 4,767,000 | 4,339,000
With related allowance recorded unpaid principal balance | 1,979,000 | 675,000
With related allowance recorded recorded investment | 1,979,000 | 675,000
With related allowance recorded allowance for loan losses allocated | 1,979,000 | 88,000
With related allowance recorded interest income recognized | 38,000 | 35,000
With related allowance recorded cash basis interest recognized | 38,000 | 31,000
With related allowance recorded average impaired loans | 1,132,000 | 677,000
Individually Evaluated for Impairment [Member] | Commercial and Industrial [Member] |  |
With no related allowance recorded unpaid principal balance | 426,000 | 614,000
With no related allowance recorded recorded investment | 0 | 334,000
With no related allowance recorded interest income recognized |  | 40,000
With no related allowance recorded cash basis interest recognized |  | 40,000
With no related allowance recorded average impaired loans | 0 | 483,000
With no related allowance recorded allowance for loan losses allocated | 0 |
Individually Evaluated for Impairment [Member] | Home Equity Loans [Member] |  |
With no related allowance recorded unpaid principal balance | 220,000 | 420,000
With no related allowance recorded recorded investment | 220,000 | 420,000
With no related allowance recorded interest income recognized | 9,000 | 27,000
With no related allowance recorded cash basis interest recognized | 9,000 | 22,000
With no related allowance recorded average impaired loans | 176,000 | 84,000
With no related allowance recorded allowance for loan losses allocated |  | 130,000
Individually Evaluated for Impairment [Member] |  |
With related allowance recorded unpaid principal balance | 19,277,000 | 12,146,000
With related allowance recorded recorded investment | 17,401,000 | 11,572,000
With related allowance recorded allowance for loan losses allocated | 2,107,000 | 655,000
With related allowance recorded interest income recognized | 864,000 | 647,000
With related allowance recorded cash basis interest recognized | 864,000 | 608,000
With related allowance recorded average impaired loans | $ 11,717,000 | $ 11,163,000

X
- Definition Allowance for loan losses allocated, impaired financing receivable + References No definition available. + Details
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X
- Definition Average impaired loans + References No definition available. + Details
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X
- 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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X
- Definition Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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- Definition Amount of interest income, recognized on cash basis, on financing receivables, for which there is no related allowance for credit losses and are recognized as impaired. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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- Definition Amount of investment in impaired financing receivables for which there is no 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 unpaid principal balance of impaired financing receivables for which there is no 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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- Definition Amount of average investment of impaired financing receivables for which there is 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 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524 + Details
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- Definition Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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- Definition Amount of interest income on financing receivables, for which there is a related allowance for credit losses, recognized on a cash-basis method of accounting that the financing receivables were impaired. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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- Definition Amount of investment in impaired financing receivables for which there is 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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