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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 | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Loans past due 90 days and still accruing | $ 396 | $ 359
Nonaccrual | 4,093 | 3,626
Residential Real Estate Loans [Member] |  |
Loans past due 90 days and still accruing | 287 | 341
Nonaccrual | 2,906 | 2,533
Commercial Real Estate Owner Occupied [Member] |  |
Nonaccrual | 1,115 | 675
Commercial Real Estate Nonowner Occupied [Member] |  |
Nonaccrual | 52 | 352
Automobile Loans [Member] |  |
Loans past due 90 days and still accruing | 9 | 11
Nonaccrual | 15 | 4
Home Equity Loans [Member] |  |
Loans past due 90 days and still accruing | 100 |
Nonaccrual |  | 62
Other Consumer Loans [Member] |  |
Loans past due 90 days and still accruing |  | 7
Nonaccrual | $ 5 |

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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