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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal income tax at statutory rate, rate		21.00%	21.00%	35.00%
State franchise taxes, net of federal benefit, rate		8.40%	8.50%	6.90%
Tax-exempt income, rate		(1.10%)	(1.40%)	(2.40%)
Tax credits, rate		(0.70%)	(0.70%)	(0.60%)
Deferred tax asset revalution adjustment, rate				7.00%
Other, net, rate		1.00%	0.60%	(1.20%)
Provision for income taxes, rate		28.60%	28.00%	44.70%
Federal income tax at statutory rate		$ 61,126	$ 44,334	$ 66,078
State franchise taxes, net of federal benefit		24,430	17,905	12,903
Tax-exempt income		(3,081)	(2,991)	(4,450)
Tax credits		(2,153)	(1,451)	(1,096)
Deferred tax asset revalution adjustment	$ 13,200			13,208
Other, net		2,925	1,315	(2,259)
Provision for income taxes		$ 83,247	$ 59,112	$ 84,384

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