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SEGMENT INFORMATION - Reconciliation of Reportable Segment Financial Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Net Income (Loss):        
Income before income taxes $ 96,386 $ 108,990 $ 295,178 $ 312,562
Income tax expense 22,659 26,968 72,155 89,187
Total consolidated net income 73,727 82,022 223,023 223,375
Segment Reconciling Items [Member]        
Net Income (Loss):        
Total income for segments 140,409 151,198 425,904 437,957
Other operating expenses 44,023 42,208 130,726 125,395
Income before income taxes 96,386 108,990 295,178 312,562
Income tax expense 22,659 26,968 72,155 89,187
Total consolidated net income 73,727 82,022 223,023 223,375
Average assets:        
Total average earning assets for segments 18,036,422 18,063,606 18,029,735 17,902,642
Average non-earning assets 846,952 832,374 845,662 845,837
Total consolidated average assets $ 18,883,374 $ 18,895,980 $ 18,875,397 $ 18,748,479