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Loans - Schedule of Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2014
Receivables [Abstract] |  |  |  |
Impaired loans without a valuation allowance | $ 624 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment | $ 675 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment | $ 1,116 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment | $ 675 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Impaired loans with a valuation allowance | 1,619 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment | 1,168 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment | 943 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment | 1,168 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Total impaired loans | 2,243 us-gaap_ImpairedFinancingReceivableRecordedInvestment | 1,843 us-gaap_ImpairedFinancingReceivableRecordedInvestment | 2,059 us-gaap_ImpairedFinancingReceivableRecordedInvestment | 1,843 us-gaap_ImpairedFinancingReceivableRecordedInvestment
Valuation allowance related to impaired loans | 428 us-gaap_ImpairedFinancingReceivableRelatedAllowance | 387 us-gaap_ImpairedFinancingReceivableRelatedAllowance | 261 us-gaap_ImpairedFinancingReceivableRelatedAllowance | 387 us-gaap_ImpairedFinancingReceivableRelatedAllowance
Total non-accrual loans | 2,424 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus | 1,705 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus | 2,615 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus | 1,705 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 | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Average investment in impaired loans | 1,958 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | 1,730 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | 2,312 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | 1,929 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Average investment in impaired loans | $ 1,958 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | $ 1,730 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | $ 2,312 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | $ 1,929 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment

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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 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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- Definition Amount of investment in impaired financing receivables for which there is 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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