SEGMENT INFORMATION - Reconciliation of Reportable Segment Financial Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net Income (Loss):
Income before income taxes	$ 97,413	$ 102,633
Income tax expense	23,955	31,935
Net income	73,458	70,698
Segment Reconciling Items [Member]
Net Income (Loss):
Segment income	141,875	145,746
Other operating expenses	44,462	43,113
Income before income taxes	97,413	102,633
Income tax expense	23,955	31,935
Net income	73,458	70,698
Average assets:
Total average earning assets for segments	18,022,985	17,709,528
Average non-earning assets	835,314	847,628
Total consolidated average assets	$ 18,858,299	$ 18,557,156