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Loans - Schedule of Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Receivables [Abstract] |  |  |
Impaired loans without a valuation allowance | $ 675 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment | $ 924 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment |
Impaired loans with a valuation allowance | 1,168 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment | 1,516 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment |
Total impaired loans | 1,843 us-gaap_ImpairedFinancingReceivableRecordedInvestment | 2,440 us-gaap_ImpairedFinancingReceivableRecordedInvestment |
Valuation allowance related to impaired loans | 387 us-gaap_ImpairedFinancingReceivableRelatedAllowance | 516 us-gaap_ImpairedFinancingReceivableRelatedAllowance |
Total non-accrual loans | 1,705 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus | 3,329 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus |
Total loans past-due ninety days or more and still accruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Average investment in impaired loans | 1,929 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | 3,274 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | 3,436 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Interest income recognized on impaired loans | 87 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod | 60 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod | 26 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Interest income recognized on a cash basis on impaired loans | $ 51 us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod | $ 17 us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod | $ 21 us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod

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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=35738203&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=35738203&loc=d3e5111-111524 + Details
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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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- Definition Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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- Definition Amount of investment in impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524 + Details
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