INCOME TAXES- Reconciliations of Income tax expenses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Computed income tax at statutory rate	$ 160,431	$ 43,621	$ 89,764
Federal and state taxes	7,014	4,944	4,467
Benefit of net exempt income	(20,717)	(26,780)	(24,811)
Disallowed NOL carryforward resulting from net exempt income	8,791	9,054	15,887
Deferred tax valuation allowance	(13,572)	(12,095)	(14,108)
Share based compensation windfull	(1,044)	157	(1,165)
Other permanent differences	(1,185)	(387)	(1,712)
Tax return to provision adjustments	(406)	597	1,846
Other-net	7,480	(5,061)	1,827
Total income tax expense	$ 146,792	$ 14,050	$ 71,995
Federal and state taxes %	1.60%	4.20%	1.60%
Benefit of net exempt income %	(4.80%)	(23.00%)	(10.40%)
Disallowed NOL carryforward resulting from net exempt income %	2.00%	7.80%	6.60%
Deferred tax valuation allowance %	(3.20%)	(10.40%)	(5.90%)
Share based compensation windfall %	(0.20%)	0.10%	(0.50%)
Other permanent differences %	(0.30%)	(0.30%)	(0.70%)
Tax-return provision adjustments %	(0.10%)	0.50%	0.80%
Other-net %	1.70%	(4.30%)	1.10%
Computed income tax at statutory tax rate %	37.50%	37.50%	37.50%
Total income tax expense (benefit) %	34.20%	12.10%	30.10%