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Income Taxes - Reconciliation of Statutory Income Tax Rate to Consolidated Effective Income Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
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	6.10%	7.00%	7.00%
Tax-exempt income, rate	(7.10%)	(9.30%)	(9.30%)
Tax credits, rate	(0.70%)	(1.10%)	(1.20%)
Other, net, rate	0.40%	1.00%	0.80%
Provision for income taxes, rate	33.70%	32.60%	32.30%
Federal income tax at statutory rate	$ 50,496	$ 40,143	$ 42,281
State franchise taxes, net of federal benefit	8,734	8,081	8,512
Tax-exempt income	(10,189)	(10,654)	(11,234)
Tax credits	(940)	(1,279)	(1,487)
Other, net	566	1,122	999
Provision for income taxes	$ 48,667	$ 37,413	$ 39,071

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