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SEGMENT INFORMATION - Reconciliation of Reportable Segment Financial Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Net Income (Loss):        
Income before income taxes $ 59,298 $ 41,191 $ 120,230 $ 82,097
Income tax expense 18,011 10,159 35,629 17,917
Net income 41,287 31,032 84,601 64,180
Segment Reconciling Items [Member]        
Net Income (Loss):        
Total income for segments and other 88,019 66,897 175,224 135,969
Other operating expenses (28,721) (25,706) (54,994) (53,872)
Income before income taxes 59,298 41,191 120,230 82,097
Income tax expense 18,011 10,159 35,629 17,917
Net income 41,287 31,032 84,601 64,180
Average assets:        
Total average earning assets for segments 11,479,210 11,381,707 11,389,075 11,307,332
Average non-earning assets 969,286 963,752 977,577 943,828
Total consolidated average assets $ 12,448,496 $ 12,345,459 $ 12,366,652 $ 12,251,160