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SEGMENT INFORMATION - Reconciliation of Reportable Segment Financial Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Net Income (Loss):        
Income before income taxes $ 100,939 $ 108,798 $ 203,572 $ 234,423
Income tax expense 30,284 34,103 62,219 77,128
Net income 70,655 74,695 141,353 157,295
Segment Reconciling Items [Member]        
Net Income (Loss):        
Segment income 141,013 145,942 286,759 306,853
Other operating expenses 40,074 37,144 83,187 72,430
Income before income taxes 100,939 108,798 203,572 234,423
Income tax expense 30,284 34,103 62,219 77,128
Net income 70,655 74,695 141,353 157,295
Average assets:        
Total average earning assets for segments 17,930,901 18,903,902 17,820,826 19,097,909
Average non-earning assets 857,677 820,924 852,680 890,043
Total consolidated average assets $ 18,788,578 $ 19,724,826 $ 18,673,506 $ 19,987,952