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Federal Income Taxes - Reconciliation of the Statutory Federal Income Tax Rate to the Effective 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	Dec. 31, 2012
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax at statutory rates									$ 4,596us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 4,285us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 4,655us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Decrease resulting from:
Tax exempt interest									(634)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(640)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(677)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Change in prior estimates and other									(91)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes	(49)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes	(74)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes
Total	$ 1,114us-gaap_IncomeTaxExpenseBenefit	$ 1,002us-gaap_IncomeTaxExpenseBenefit	$ 881us-gaap_IncomeTaxExpenseBenefit	$ 874us-gaap_IncomeTaxExpenseBenefit	$ 864us-gaap_IncomeTaxExpenseBenefit	$ 791us-gaap_IncomeTaxExpenseBenefit	$ 1,009us-gaap_IncomeTaxExpenseBenefit	$ 932us-gaap_IncomeTaxExpenseBenefit	$ 3,871us-gaap_IncomeTaxExpenseBenefit	$ 3,596us-gaap_IncomeTaxExpenseBenefit	$ 3,904us-gaap_IncomeTaxExpenseBenefit

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

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-Number 210

-Section 08

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Glossary Income Tax Expense (or Benefit)

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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 revisions of previously reported 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.

+ References

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