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Aging of Recorded Investment in Loans by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-59 Days Past Due | $ 6,181 | $ 7,443
60-89 Days Past Due | 1,722 | 1,220
Over 90 Days Past Due | 1,666 | 2,852
Total Past Due | 9,569 | 11,515
Current | 277,057 | 269,841
Recorded investment in loans | 286,626 | 281,356
Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-59 Days Past Due | 4,618 | 5,205
60-89 Days Past Due | 1,377 | 1,068
Over 90 Days Past Due | 1,122 | 1,035
Total Past Due | 7,117 | 7,308
Current | 104,988 | 109,560
Recorded investment in loans | 112,105 | 116,868
Land |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-59 Days Past Due | 301 | 442
60-89 Days Past Due | 4 | 43
Over 90 Days Past Due | 0 | 43
Total Past Due | 305 | 528
Current | 9,402 | 9,444
Recorded investment in loans | 9,707 | 9,972
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-59 Days Past Due | 113 | 0
60-89 Days Past Due | 141 | 0
Over 90 Days Past Due | 0 | 247
Total Past Due | 254 | 247
Current | 11,642 | 6,732
Recorded investment in loans | 11,896 | 6,979
Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-59 Days Past Due | 244 | 676
60-89 Days Past Due | 0 | 0
Over 90 Days Past Due | 443 | 1,258
Total Past Due | 687 | 1,934
Current | 63,419 | 55,906
Recorded investment in loans | 64,106 | 57,840
Commercial Business |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-59 Days Past Due | 8 | 256
60-89 Days Past Due | 17 | 0
Over 90 Days Past Due | 0 | 0
Total Past Due | 25 | 256
Current | 19,167 | 20,520
Recorded investment in loans | 19,192 | 20,776
Home Equity and Second Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-59 Days Past Due | 584 | 558
60-89 Days Past Due | 140 | 72
Over 90 Days Past Due | 69 | 246
Total Past Due | 793 | 876
Current | 36,851 | 38,011
Recorded investment in loans | 37,644 | 38,887
Other Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-59 Days Past Due | 313 | 306
60-89 Days Past Due | 43 | 37
Over 90 Days Past Due | 32 | 23
Total Past Due | 388 | 366
Current | 31,588 | 29,668
Recorded investment in loans | $ 31,976 | $ 30,034

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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 current. + 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 of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: 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 2: 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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