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Allowance for Loan Losses (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment | $ 1,562,000 |  | $ 1,562,000 |  | $ 1,652,000
Collectively evaluated for impairment | 3,342,000 |  | 3,342,000 |  | 3,084,000
Acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Ending balance | 4,904,000 | 4,591,000 | 4,904,000 | 4,591,000 |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 4,835,000 | 4,432,000 | 4,736,000 | 4,182,000 |
Provisions for loan losses | 100,000 | 350,000 | 575,000 | 1,125,000 |
Charge-offs | (114,000) | (259,000) | (708,000) | (897,000) |
Recoveries | 83,000 | 68,000 | 301,000 | 181,000 |
Ending balance | 4,904,000 | 4,591,000 | 4,904,000 | 4,591,000 |
Residential |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment | 95,000 |  | 95,000 |  | 213,000
Collectively evaluated for impairment | 799,000 |  | 799,000 |  | 709,000
Acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Ending balance | 894,000 | 1,210,000 | 894,000 | 1,210,000 |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 905,000 | 1,173,000 | 922,000 | 828,000 |
Provisions for loan losses | (26,000) | 51,000 | 211,000 | 697,000 |
Charge-offs | 0 | (15,000) | (298,000) | (327,000) |
Recoveries | 15,000 | 1,000 | 59,000 | 12,000 |
Ending balance | 894,000 | 1,210,000 | 894,000 | 1,210,000 |
Land |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 70,000 |  | 70,000 |  | 71,000
Acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Ending balance | 70,000 | 102,000 | 70,000 | 102,000 |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 73,000 | 102,000 | 71,000 | 93,000 |
Provisions for loan losses | (3,000) | 0 | 1,000 | 12,000 |
Charge-offs | 0 | 0 | (2,000) | (4,000) |
Recoveries | 0 | 0 | 0 | 1,000 |
Ending balance | 70,000 | 102,000 | 70,000 | 102,000 |
Construction |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 50,000 |  | 50,000 |  | 0
Acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Ending balance | 50,000 | 60,000 | 50,000 | 60,000 |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 60,000 | 40,000 | 0 | 33,000 |
Provisions for loan losses | (10,000) | 20,000 | 50,000 | 27,000 |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Ending balance | 50,000 | 60,000 | 50,000 | 60,000 |
Commercial Real Estate |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment | 144,000 |  | 144,000 |  | 275,000
Collectively evaluated for impairment | 1,097,000 |  | 1,097,000 |  | 1,035,000
Acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Ending balance | 1,241,000 | 961,000 | 1,241,000 | 961,000 |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 1,291,000 | 826,000 | 1,310,000 | 1,269,000 |
Provisions for loan losses | (52,000) | 135,000 | 3,000 | (308,000) |
Charge-offs | (1,000) | 0 | (89,000) | 0 |
Recoveries | 3,000 | 0 | 17,000 | 0 |
Ending balance | 1,241,000 | 961,000 | 1,241,000 | 961,000 |
Commercial Business |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment | 1,315,000 |  | 1,315,000 |  | 1,098,000
Collectively evaluated for impairment | 159,000 |  | 159,000 |  | 125,000
Acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Ending balance | 1,474,000 | 1,099,000 | 1,474,000 | 1,099,000 |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 1,260,000 | 1,154,000 | 1,223,000 | 1,160,000 |
Provisions for loan losses | 210,000 | (60,000) | 196,000 | (70,000) |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 4,000 | 5,000 | 55,000 | 9,000 |
Ending balance | 1,474,000 | 1,099,000 | 1,474,000 | 1,099,000 |
Home Equity and Second Mortgage |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment | 8,000 |  | 8,000 |  | 66,000
Collectively evaluated for impairment | 857,000 |  | 857,000 |  | 853,000
Acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Ending balance | 865,000 | 853,000 | 865,000 | 853,000 |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 894,000 | 840,000 | 919,000 | 400,000 |
Provisions for loan losses | (13,000) | 158,000 | (37,000) | 765,000 |
Charge-offs | (24,000) | (154,000) | (59,000) | (330,000) |
Recoveries | 8,000 | 9,000 | 42,000 | 18,000 |
Ending balance | 865,000 | 853,000 | 865,000 | 853,000 |
Other Consumer |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 310,000 |  | 310,000 |  | 291,000
Acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Ending balance | 310,000 | 306,000 | 310,000 | 306,000 |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 352,000 | 297,000 | 291,000 | 399,000 |
Provisions for loan losses | (6,000) | 46,000 | 151,000 | 2,000 |
Charge-offs | (89,000) | (90,000) | (260,000) | (236,000) |
Recoveries | 53,000 | 53,000 | 128,000 | 141,000 |
Ending balance | $ 310,000 | $ 306,000 | $ 310,000 | $ 306,000 |

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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=28368275&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=28368275&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=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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