Income Taxes - Schedule of Reconciliation of Differences in Company's 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 federal income tax rate	$ 10,256	$ 7,602	$ 11,077
Change resulting from:
Tax-exempt interest	(841)	(675)	(585)
Increase in cash value of bank owned life insurance	(446)	(34)
Other	316	392	64
Applicable income tax expense	$ 9,285	$ 7,285	$ 10,556