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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	$ 624us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	$ 675us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	$ 1,116us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	$ 675us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Impaired loans with a valuation allowance	1,619us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	1,168us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	943us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	1,168us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Total impaired loans	2,243us-gaap_ImpairedFinancingReceivableRecordedInvestment	1,843us-gaap_ImpairedFinancingReceivableRecordedInvestment	2,059us-gaap_ImpairedFinancingReceivableRecordedInvestment	1,843us-gaap_ImpairedFinancingReceivableRecordedInvestment
Valuation allowance related to impaired loans	428us-gaap_ImpairedFinancingReceivableRelatedAllowance	387us-gaap_ImpairedFinancingReceivableRelatedAllowance	261us-gaap_ImpairedFinancingReceivableRelatedAllowance	387us-gaap_ImpairedFinancingReceivableRelatedAllowance
Total non-accrual loans	2,424us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus	1,705us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus	2,615us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus	1,705us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Total loans past-due ninety days or more and still accruing	0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Average investment in impaired loans	1,958us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment	1,730us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment	2,312us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment	1,929us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Average investment in impaired loans	$ 1,958us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment	$ 1,730us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment	$ 2,312us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment	$ 1,929us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment

X

- 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

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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

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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



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Amount of allowance for credit losses related to recorded investment.

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Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

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