SEGMENT INFORMATION - Reconciliation of Reportable Segment Financial Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net Income (Loss):
Income before income taxes	$ 108,798	$ 110,650	$ 234,423	$ 199,822
Income tax expense	34,103	40,092	77,128	68,114
Net income	74,695	70,558	157,295	131,708
Segment Reconciling Items [Member]
Net Income (Loss):
Segment income	145,942	164,213	306,853	309,127
Other operating expenses	37,144	53,563	72,430	109,305
Income before income taxes	108,798	110,650	234,423	199,822
Income tax expense	34,103	40,092	77,128	68,114
Net income	74,695	70,558	157,295	131,708
Average assets:
Total average earning assets for segments	18,903,902	19,074,536	19,097,909	18,492,045
Average non-earning assets	820,924	1,109,941	890,043	1,146,337
Total consolidated average assets	$ 19,724,826	$ 20,184,477	$ 19,987,952	$ 19,638,382