SEGMENT INFORMATION - Reconciliation of Reportable Segment Financial Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net Income (Loss):
Total before tax	$ 427,817	$ 116,323	$ 239,372
Income tax expense	146,792	14,050	71,995
Net income	281,025	102,273	167,377
Segment Reconciling Items [Member]
Net Income (Loss):
Segment income	620,011	281,699	365,237
Other operating expenses	192,194	165,376	125,865
Total before tax	427,817	116,323	239,372
Income tax expense	146,792	14,050	71,995
Net income	281,025	102,273	167,377
Average assets:
Total average earning assets for segments	19,235,941	14,201,505	11,497,408
Average non-earning assets	1,067,092	1,031,141	954,726
Total consolidated average assets	$ 20,303,033	$ 15,232,646	$ 12,452,134