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Note 4 - Loans and Allowance for Loan Losses (Detail) - Aging of the Recorded Investment of Past Due Loans (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Total | $ 551,274 | $ 558,288
Residential Real Estate Loans [Member] |  |
30-59 Days Past Due | 3,275 | 5,525
60-89 Days Past Due | 898 | 1,033
90 or More Days Past Due | 3,096 | 2,797
Total Past Due | 7,269 | 9,355
Loans Not Past Due | 216,283 | 216,667
Total | 223,552 | 226,022
Commercial Real Estate Owner Occupied [Member] |  |
30-59 Days Past Due | 816 | 753
60-89 Days Past Due | 440 | 111
90 or More Days Past Due | 675 | 675
Total Past Due | 1,931 | 1,539
Loans Not Past Due | 100,185 | 103,303
Total | 102,116 | 104,842
Commercial Real Estate Nonowner Occupied [Member] |  |
90 or More Days Past Due | 52 | 352
Total Past Due | 52 | 352
Loans Not Past Due | 50,827 | 52,440
Total | 50,879 | 52,792
Construction [Member] |  |
Loans Not Past Due | 19,270 | 17,376
Total | 19,270 | 17,376
Commercial and Industrial [Member] |  |
30-59 Days Past Due | 180 | 202
Total Past Due | 180 | 202
Loans Not Past Due | 58,005 | 57,037
Total | 58,185 | 57,239
Automobile Loans [Member] |  |
30-59 Days Past Due | 683 | 905
60-89 Days Past Due | 145 | 138
90 or More Days Past Due | 9 | 13
Total Past Due | 837 | 1,056
Loans Not Past Due | 39,236 | 40,112
Total | 40,073 | 41,168
Home Equity Loans [Member] |  |
30-59 Days Past Due | 20 | 112
60-89 Days Past Due |  | 37
90 or More Days Past Due | 100 | 62
Total Past Due | 120 | 211
Loans Not Past Due | 18,031 | 18,121
Total | 18,151 | 18,332
Other Consumer Loans [Member] |  |
30-59 Days Past Due | 752 | 1,066
60-89 Days Past Due | 31 | 162
90 or More Days Past Due | 5 | 7
Total Past Due | 788 | 1,235
Loans Not Past Due | 38,260 | 39,282
Total | 39,048 | 40,517
Past Due Loans (Member) |  |
30-59 Days Past Due | 5,726 | 8,563
60-89 Days Past Due | 1,514 | 1,481
90 or More Days Past Due | 3,937 | 3,906
Total Past Due | 11,177 | 13,950
Loans Not Past Due | 540,097 | 544,338
Total | $ 551,274 | $ 558,288

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- Definition Financing receivables that are less than 60 days past due but more than 29 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are less than 90 days past due but more than 59 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are equal to or greater than 90 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953401-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at 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 7A -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953401-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph e -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 116 -IssueDate 2006-05-01 -Chapter 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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