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Income Taxes - Schedule of Income (Loss) Before Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amount
Federal income tax at statutory rate									$ 36,951	$ 21,445	$ 19,121
State income tax, net of federal benefit									8,564	5,249	4,067
Tax-exempt interest, net of disallowance									(492)	(385)	(360)
Bank-owned life insurance									(1,579)	(1,677)	(1,547)
Tax credits									(2,034)	(1,266)	(444)
Equity-based compensation									185	132	(547)
Non-deductible executive compensation									751	440	230
Unrecorded basis difference in foreign subsidiaries									(304)	(144)	343
Enactment of federal tax reform											(21)
Other									1,338	(1,001)	(1,483)
Income tax expense	$ 22,225	$ 12,201	$ 7,048	$ 1,906	$ 7,451	$ 8,020	$ 2,491	$ 4,831	$ 43,380	$ 22,793	$ 19,359
% of pretax income
Federal income tax at statutory rate									21.00%	21.00%	21.00%
State income tax, net of federal benefit									4.87%	5.14%	4.47%
Tax-exempt interest, net of disallowance									(0.28%)	(0.38%)	(0.40%)
Bank-owned life insurance									(0.90%)	(1.64%)	(1.70%)
Tax credits									(1.16%)	(1.24%)	(0.49%)
Equity-based compensation									0.11%	0.13%	(0.60%)
Non-deductible executive compensation									0.43%	0.43%	0.25%
Unrecorded basis difference in foreign subsidiaries									(0.17%)	(0.14%)	0.38%
Enactment of federal tax reform											(0.0002)
Other									0.75%	(0.98%)	(1.63%)
Effective income tax rate									24.65%	22.32%	21.26%

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