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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Tax at statutory rate, Amount	$ 24,843	$ 21,747	$ 19,867
Income Tax Reconciliation, Bank Owned Life Insurance Income	(1,894)	(1,926)	(1,939)
Tax-exempt interest income, net, Amount	(2,232)	(2,133)	(2,600)
Tax credits, Amount	(61)	(134)	(144)
Other, Amount	180	126	97
Total tax provision (benefit), Amount	$ 20,836	$ 17,680	$ 15,281
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Tax at statutory rate, Pretax Income	35.00%	35.00%	35.00%
Income from bank owned life insurance, Pretax Income	(3.00%)	(3.00%)	(3.00%)
Tax-exempt interest income, net, Pretax Income	(3.00%)	(4.00%)	(5.00%)
Tax credits, Pretax Income	(0.00%)	(0.00%)	(0.00%)
Other, Pretax Income	0.00%	0.00%	0.00%
Total tax provision (benefit), Pretax Income	29.00%	28.00%	27.00%

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

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