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Income Taxes - Reconciliation of Income Tax Attributable to Pre-Tax Income at Federal Statutory Tax Rates to Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Tax at statutory rate, value	$ 8,057	$ 8,241	$ 7,222
Tax exempt income, net value	(1,664)	(1,553)	(1,353)
Bank owned life insurance, value	(543)	(341)	(325)
Merger costs, value	233	0	0
Other, value	257	64	(15)
Income tax expense	$ 6,340	$ 6,411	$ 5,529
Tax at statutory rate, percent	35.00%	35.00%	35.00%
Tax exempt income, net percent	(7.20%)	(6.60%)	(6.60%)
Bank owned life insurance, percent	(2.40%)	(1.40%)	(1.60%)
Merger costs, percent	1.00%	0.00%	0.00%
Other, percent	1.10%	0.20%	0.00%
Income tax expense, percent	27.50%	27.20%	26.80%

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