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Aging of Recorded Investment in Loans by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-59 Days Past Due | $ 5,289 | $ 6,711
60-89 Days Past Due | 842 | 1,003
Over 90 Days Past Due | 2,231 | 2,326
Total Past Due | 8,362 | 10,040
Current | 273,114 | 276,196
Recorded investment in loans | 281,476 | 286,236
Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-59 Days Past Due | 3,989 | 4,085
60-89 Days Past Due | 347 | 871
Over 90 Days Past Due | 1,587 | 1,644
Total Past Due | 5,923 | 6,600
Current | 99,879 | 102,003
Recorded investment in loans | 105,802 | 108,603
Land |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-59 Days Past Due | 187 | 343
60-89 Days Past Due | 135 | 0
Over 90 Days Past Due | 136 | 119
Total Past Due | 458 | 462
Current | 8,979 | 9,195
Recorded investment in loans | 9,437 | 9,657
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-59 Days Past Due | 0 | 171
60-89 Days Past Due | 0 | 0
Over 90 Days Past Due | 111 | 113
Total Past Due | 111 | 284
Current | 11,704 | 11,479
Recorded investment in loans | 11,815 | 11,763
Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-59 Days Past Due | 178 | 360
60-89 Days Past Due | 334 | 0
Over 90 Days Past Due | 125 | 335
Total Past Due | 637 | 695
Current | 68,931 | 68,207
Recorded investment in loans | 69,568 | 68,902
Commercial Business |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-59 Days Past Due | 237 | 36
60-89 Days Past Due | 0 | 0
Over 90 Days Past Due | 0 | 0
Total Past Due | 237 | 36
Current | 18,136 | 18,619
Recorded investment in loans | 18,373 | 18,655
Home Equity and Second Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-59 Days Past Due | 411 | 1,206
60-89 Days Past Due | 0 | 102
Over 90 Days Past Due | 263 | 97
Total Past Due | 674 | 1,405
Current | 34,864 | 35,881
Recorded investment in loans | 35,538 | 37,286
Other Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-59 Days Past Due | 287 | 510
60-89 Days Past Due | 26 | 30
Over 90 Days Past Due | 9 | 18
Total Past Due | 322 | 558
Current | 30,621 | 30,812
Recorded investment in loans | $ 30,943 | $ 31,370

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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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