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CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) BY COMPONENT (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance $ 1,864,560 $ 1,691,617 $ 1,836,683 $ 1,638,394
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity 1,206 1,406 2,375 2,612
Income tax effect (320) (361) (627) (667)
Other comprehensive income (loss), net of income tax effect (3,684) 947 25,235 5,211
Ending balance 1,863,558 1,746,865 1,863,558 1,746,865
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (67,641) (132,305) (96,560) (136,569)
Other comprehensive income (loss), net of income tax effect (3,684) 947 25,235 5,211
Ending balance (71,325) (131,358) (71,325) (131,358)
Unrealized Gains (Losses) on Available for Sale Securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Unrealized gains (losses) arising during period, before tax (8,011) (851) (21,260) 3,629
Income tax effect 2,119 219 5,603 (919)
Other comprehensive income (loss) before reclassifications (5,892) (632) (15,657) 2,710
Reclassification adjustments for (gains) losses included in net income, before tax 1,797 719 53,116 749
Income tax effect (475) (185) (13,972) (193)
Amounts reclassified from accumulated other comprehensive income (loss) to net income 1,322 534 39,144 556
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity 1,206 1,406 2,375 2,612
Income tax effect (320) (361) (627) (667)
Amortization of unrealized loss on securities transferred from available for sale to held to maturity 886 1,045 1,748 1,945
Other comprehensive income (loss), net of income tax effect $ (3,684) $ 947 $ 25,235 $ 5,211