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Income Taxes - Reconciliation of Statutory Income Tax Rate to Consolidated Effective Income Tax Rate (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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		6.90%	7.00%	6.90%
Tax-exempt income, rate		(2.40%)	(3.60%)	(5.00%)
Tax credits, rate		(0.60%)	(0.50%)	(0.70%)
Deferred tax asset revalution adjustment, rate		7.00%	0.00%	0.00%
Other, net, rate		(1.20%)	(0.40%)	(1.70%)
Provision for income taxes, rate		44.70%	37.50%	34.50%
Federal income tax at statutory rate		$ 66,078	$ 56,800	$ 52,978
State franchise taxes, net of federal benefit		12,903	11,299	10,457
Tax-exempt income		(4,450)	(5,848)	(7,619)
Tax credits		(1,096)	(846)	(1,014)
Deferred tax asset revalution adjustment	$ 13,200	13,208	0	0
Other, net		(2,259)	(548)	(2,581)
Provision for income taxes		$ 84,384	$ 60,857	$ 52,221

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