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Recorded Investment in Nonperforming Loans by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual Loans | $ 7,992 | $ 7,401
Loans 90+ Days Past Due Still Accruing | 99 | 363
Total Nonperforming Loans | 9,569 | 11,515
Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual Loans | 2,698 | 2,281
Loans 90+ Days Past Due Still Accruing | 67 | 143
Total Nonperforming Loans | 7,117 | 7,308
Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual Loans | 4 | 5
Loans 90+ Days Past Due Still Accruing | 0 | 38
Total Nonperforming Loans | 305 | 528
Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual Loans | 394 | 247
Loans 90+ Days Past Due Still Accruing | 0 | 0
Total Nonperforming Loans | 254 | 247
Commercial Real Estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual Loans | 2,986 | 2,853
Loans 90+ Days Past Due Still Accruing | 0 | 0
Total Nonperforming Loans | 687 | 1,934
Commercial Business |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual Loans | 1,809 | 1,928
Loans 90+ Days Past Due Still Accruing | 0 | 0
Total Nonperforming Loans | 25 | 256
Home Equity and Second Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual Loans | 101 | 87
Loans 90+ Days Past Due Still Accruing | 0 | 159
Total Nonperforming Loans | 793 | 876
Other Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual Loans | 0 | 0
Loans 90+ Days Past Due Still Accruing | 32 | 23
Total Nonperforming Loans | 388 | 366
Nonperforming Financing Receivable |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Nonperforming Loans | 8,091 | 7,764
Nonperforming Financing Receivable | Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Nonperforming Loans | 2,765 | 2,424
Nonperforming Financing Receivable | Land |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Nonperforming Loans | 4 | 43
Nonperforming Financing Receivable | Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Nonperforming Loans | 394 | 247
Nonperforming Financing Receivable | Commercial Real Estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Nonperforming Loans | 2,986 | 2,853
Nonperforming Financing Receivable | Commercial Business |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Nonperforming Loans | 1,809 | 1,928
Nonperforming Financing Receivable | Home Equity and Second Mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Nonperforming Loans | 101 | 246
Nonperforming Financing Receivable | Other Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Nonperforming Loans | $ 32 | $ 23

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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
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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
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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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