SEGMENT INFORMATION - Reconciliation of Reportable Segment Financial Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Income (Loss):
Income before income taxes	$ 397,436	$ 447,584	$ 427,817
Income tax expense	94,572	142,512	146,792
Net income	302,864	305,072	281,025
Segment Reconciling Items [Member]
Net Income (Loss):
Segment income	566,138	602,868	620,011
Other operating expenses	168,702	155,284	192,194
Income before income taxes	397,436	447,584	427,817
Income tax expense	94,572	142,512	146,792
Net income	302,864	305,072	281,025
Average assets:
Total average earning assets for segments	17,866,659	18,516,894	19,235,941
Average non-earning assets	839,764	861,755	1,067,092
Total consolidated average assets	$ 18,706,423	$ 19,378,649	$ 20,303,033