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Allowance for Loan Losses (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment | $ 1,651,000 |  | $ 1,651,000 |  | $ 1,658,000
Collectively evaluated for impairment | 2,940,000 |  | 2,940,000 |  | 2,524,000
Acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Ending balance | 4,591,000 | 4,663,000 | 4,591,000 | 4,663,000 |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 4,432,000 | 4,561,000 | 4,182,000 | 4,473,000 |
Provisions for loan losses | 350,000 | 400,000 | 1,125,000 | 1,325,000 |
Charge-offs | (259,000) | (403,000) | (897,000) | (1,388,000) |
Recoveries | 68,000 | 105,000 | 181,000 | 253,000 |
Ending balance | 4,591,000 | 4,663,000 | 4,591,000 | 4,663,000 |
Residential |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment | 267,000 |  | 267,000 |  | 183,000
Collectively evaluated for impairment | 943,000 |  | 943,000 |  | 645,000
Acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Ending balance | 1,210,000 | 1,288,000 | 1,210,000 | 1,288,000 |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 1,173,000 | 1,217,000 | 828,000 | 1,024,000 |
Provisions for loan losses | 51,000 | 146,000 | 697,000 | 601,000 |
Charge-offs | (15,000) | (80,000) | (327,000) | (346,000) |
Recoveries | 1,000 | 5,000 | 12,000 | 9,000 |
Ending balance | 1,210,000 | 1,288,000 | 1,210,000 | 1,288,000 |
Land |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 102,000 |  | 102,000 |  | 93,000
Acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Ending balance | 102,000 | 61,000 | 102,000 | 61,000 |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 102,000 | 59,000 | 93,000 | 55,000 |
Provisions for loan losses | 0 | 2,000 | 12,000 | 6,000 |
Charge-offs | 0 | 0 | (4,000) | 0 |
Recoveries | 0 | 0 | 1,000 | 0 |
Ending balance | 102,000 | 61,000 | 102,000 | 61,000 |
Construction |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 60,000 |  | 60,000 |  | 33,000
Acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Ending balance | 60,000 | 31,000 | 60,000 | 31,000 |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 40,000 | 26,000 | 33,000 | 21,000 |
Provisions for loan losses | 20,000 | 2,000 | 27,000 | 7,000 |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 3,000 | 0 | 3,000 |
Ending balance | 60,000 | 31,000 | 60,000 | 31,000 |
Commercial Real Estate |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment | 441,000 |  | 441,000 |  | 539,000
Collectively evaluated for impairment | 520,000 |  | 520,000 |  | 730,000
Acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Ending balance | 961,000 | 1,385,000 | 961,000 | 1,385,000 |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 826,000 | 1,271,000 | 1,269,000 | 1,051,000 |
Provisions for loan losses | 135,000 | 114,000 | (308,000) | 402,000 |
Charge-offs | 0 | 0 | 0 | (68,000) |
Recoveries | 0 | 0 | 0 | 0 |
Ending balance | 961,000 | 1,385,000 | 961,000 | 1,385,000 |
Commercial Business |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment | 914,000 |  | 914,000 |  | 936,000
Collectively evaluated for impairment | 185,000 |  | 185,000 |  | 224,000
Acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Ending balance | 1,099,000 | 1,186,000 | 1,099,000 | 1,186,000 |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 1,154,000 | 1,020,000 | 1,160,000 | 1,251,000 |
Provisions for loan losses | (60,000) | 130,000 | (70,000) | 199,000 |
Charge-offs | 0 | 0 | 0 | (305,000) |
Recoveries | 5,000 | 36,000 | 9,000 | 41,000 |
Ending balance | 1,099,000 | 1,186,000 | 1,099,000 | 1,186,000 |
Home Equity and Second Mortgage |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment | 29,000 |  | 29,000 |  | 0
Collectively evaluated for impairment | 824,000 |  | 824,000 |  | 400,000
Acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Ending balance | 853,000 | 331,000 | 853,000 | 331,000 |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 840,000 | 562,000 | 400,000 | 606,000 |
Provisions for loan losses | 158,000 | 3,000 | 765,000 | 136,000 |
Charge-offs | (154,000) | (250,000) | (330,000) | (458,000) |
Recoveries | 9,000 | 16,000 | 18,000 | 47,000 |
Ending balance | 853,000 | 331,000 | 853,000 | 331,000 |
Other Consumer |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 306,000 |  | 306,000 |  | 399,000
Acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Ending balance | 306,000 | 381,000 | 306,000 | 381,000 |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 297,000 | 406,000 | 399,000 | 465,000 |
Provisions for loan losses | 46,000 | 3,000 | 2,000 | (26,000) |
Charge-offs | (90,000) | (73,000) | (236,000) | (211,000) |
Recoveries | 53,000 | 45,000 | 141,000 | 153,000 |
Ending balance | $ 306,000 | $ 381,000 | $ 306,000 | $ 381,000 |

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- Definition Reflects the amount charged against earnings during the period as bad debt expense, net of recoveries of previously expensed credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables acquired with deteriorated credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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