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SEGMENT INFORMATION - Reconciliation of Reportable Segment Financial Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Net Income (Loss):        
Income before income taxes $ 106,631 $ 112,735 $ 341,054 $ 312,557
Income tax expense 32,028 37,057 109,156 105,171
Net income 74,603 75,678 231,898 207,386
Segment Reconciling Items [Member]        
Net Income (Loss):        
Segment income 147,438 155,667 454,291 464,794
Other operating expenses 40,807 42,932 113,237 152,237
Income before income taxes 106,631 112,735 341,054 312,557
Income tax expense 32,028 37,057 109,156 105,171
Net income 74,603 75,678 231,898 207,386
Average assets:        
Total average earning assets for segments 18,311,378 20,047,397 18,830,683 19,014,027
Average non-earning assets 835,740 1,024,385 873,911 1,105,223
Total consolidated average assets $ 19,147,118 $ 21,071,782 $ 19,704,594 $ 20,119,250