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Income Taxes - Schedule of Effective Income Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income tax expense at federal statutory rate									$ 1,828us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 1,848us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase (decrease) resulting from:
Tax-exempt interest									(276)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(394)us-gaap_IncomeTaxReconciliationTaxExemptIncome
State income tax expense, net of federal income taxes									279us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	190us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other									(2)us-gaap_IncomeTaxReconciliationOtherAdjustments	(135)us-gaap_IncomeTaxReconciliationOtherAdjustments
Total	$ 532us-gaap_IncomeTaxExpenseBenefit	$ 413us-gaap_IncomeTaxExpenseBenefit	$ 608us-gaap_IncomeTaxExpenseBenefit	$ 276us-gaap_IncomeTaxExpenseBenefit	$ 303us-gaap_IncomeTaxExpenseBenefit	$ 350us-gaap_IncomeTaxExpenseBenefit	$ 512us-gaap_IncomeTaxExpenseBenefit	$ 344us-gaap_IncomeTaxExpenseBenefit	$ 1,829us-gaap_IncomeTaxExpenseBenefit	$ 1,509us-gaap_IncomeTaxExpenseBenefit

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit).

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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