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SEGMENT INFORMATION - Reconciliation of Reportable Segment Financial Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Net Income (Loss):        
Income before income taxes $ 101,379 $ 100,939 $ 198,792 $ 203,572
Income tax expense 25,541 30,284 49,496 62,219
Total consolidated net income 75,838 70,655 149,296 141,353
Segment Reconciling Items [Member]        
Net Income (Loss):        
Total income for segments 143,620 141,013 285,495 286,759
Other operating expenses 42,241 40,074 86,703 83,187
Income before income taxes 101,379 100,939 198,792 203,572
Income tax expense 25,541 30,284 49,496 62,219
Total consolidated net income 75,838 70,655 149,296 141,353
Average assets:        
Total average earning assets for segments 18,029,725 17,930,901 18,026,355 17,820,826
Average non-earning assets 854,706 857,677 845,010 852,680
Total consolidated average assets $ 18,884,431 $ 18,788,578 $ 18,871,365 $ 18,673,506