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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. 22, 2017	Dec. 21, 2017	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal income tax at statutory rate, amount											$ 43,357	$ 43,608	$ 30,973
State income tax, amount											3,835	4,548	1,434
Tax-exempt interest, net of disallowance amount											(381)	(237)	(277)
Bank-owned life insurance, amount											(2,675)	(1,716)	(2,422)
Share-based compensation, amount											(10,741)	(3,659)	0
Unrecorded basis difference in foreign subsidiary, amount											4,527	2,830	0
Enactment of federal tax reform, amount											5,505
Other, amount											961	519	204
Income tax expense			$ 10,806	$ 14,899	$ 12,327	$ 7,009	$ 9,320	$ 14,558	$ 12,963	$ 9,052	$ 45,042	$ 45,893	$ 29,912
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal income tax at statutory rate, percentage of pretax income	21.00%	35.00%									35.00%	35.00%	35.00%
State income tax, percentage of pretax income											3.10%	3.65%	1.62%
Tax-exempt interest, net of disallowance percentage of pretax income											(0.31%)	(0.19%)	(0.31%)
Bank-owned life insurance, percentage of pretax income											(2.16%)	(1.38%)	(2.73%)
Share-based compensation, percentage of pretax income											(8.67%)	(2.94%)	0.00%
Unrecorded basis difference in foreign subsidiary, percentage of pretax income											3.65%	2.27%	0.00%
Enactment of federal tax reform, percentage of pretax income											4.44%
Other, percentage of pretax income											0.78%	0.42%	0.22%
Effective income tax rate, percentage of pretax income											36.36%	36.83%	33.80%
Executive Officer
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Share-based compensation, amount											$ 654
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Share-based compensation, percentage of pretax income											0.53%

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