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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal income tax at statutory rate, rate	21.00%	35.00%	35.00%
State franchise taxes, net of federal benefit, rate	8.50%	6.90%	7.00%
Tax-exempt income, rate	(1.40%)	(2.40%)	(3.60%)
Tax credits, rate	(0.70%)	(0.60%)	(0.50%)
Deferred tax asset revalution adjustment, rate	0.00%	7.00%	0.00%
Other, net, rate	0.60%	(1.20%)	(0.40%)
Provision for income taxes, rate	28.00%	44.70%	37.50%
Federal income tax at statutory rate	$ 44,334	$ 66,078	$ 56,800
State franchise taxes, net of federal benefit	17,905	12,903	11,299
Tax-exempt income	(2,991)	(4,450)	(5,848)
Tax credits	(1,451)	(1,096)	(846)
Deferred tax asset revalution adjustment	0	13,208	0
Other, net	1,315	(2,259)	(548)
Provision for income taxes	$ 59,112	$ 84,384	$ 60,857

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