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Income Taxes - Reconciliation of Statutory Income Tax Rate to Consolidated Effective Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal income tax at statutory rate, rate	35.00%	35.00%	35.00%
State franchise taxes, net of federal benefit, rate	7.00%	6.90%	6.90%
Tax-exempt income, rate	(3.60%)	(5.00%)	(5.30%)
Tax credits, rate	(0.50%)	(0.70%)	(0.60%)
Other, net, rate	(0.40%)	(1.70%)	0.10%
Provision for income taxes, rate	37.50%	34.50%	36.10%
Federal income tax at statutory rate	$ 56,800	$ 52,978	$ 56,979
State franchise taxes, net of federal benefit	11,299	10,457	11,233
Tax-exempt income	(5,848)	(7,619)	(8,622)
Tax credits	(846)	(1,014)	(1,014)
Other, net	(548)	(2,581)	200
Provision for income taxes	$ 60,857	$ 52,221	$ 58,776

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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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