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Note 4 - Loans and Allowance for Loan Losses (Detail) - Recorded Investment of Nonaccrual Loans and Loans Past Due 90 days (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Loans past due 90 days and still accruing | $ 371 | $ 459
Nonaccrual | 6,772 | 2,678
Residential Real Estate Loans [Member] |  |
Loans past due 90 days and still accruing | 260 | 439
Nonaccrual | 3,385 | 2,536
Commercial Real Estate Owner Occupied [Member] |  |
Nonaccrual | 758 | 125
Commercial Real Estate Nonowner Occupied [Member] |  |
Nonaccrual | 959 |
Construction [Member] |  |
Nonaccrual | 1,519 |
Commercial and Industrial [Member] |  |
Nonaccrual | 36 |
Automobile Loans [Member] |  |
Loans past due 90 days and still accruing | 59 | 13
Nonaccrual | 25 | 12
Home Equity Loans [Member] |  |
Loans past due 90 days and still accruing | 43 |
Nonaccrual | 53 | 5
Other Consumer Loans [Member] |  |
Loans past due 90 days and still accruing | 9 | 7
Nonaccrual | $ 37 |

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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5111-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5111-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant