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SEGMENT INFORMATION - Reconciliation of Reportable Segment Financial Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Net Income (Loss):    
Income before income taxes $ 125,625 $ 89,172
Income tax expense 43,025 28,022
Total consolidated net income 82,600 61,150
Segment Reconciling Items [Member]    
Net Income (Loss):    
Segment income 160,911 144,914
Other operating expenses 35,286 55,742
Income before income taxes 125,625 89,172
Income tax expense 43,025 28,022
Total consolidated net income 82,600 61,150
Average assets:    
Total average earning assets for segments 19,306,990 17,917,974
Average non-earning assets 947,011 1,168,336
Total consolidated average assets $ 20,254,001 $ 19,086,310