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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance $ 1,691,617 $ 1,421,020 $ 1,638,394 $ 1,402,961
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity 1,406 1,449 2,612 2,321
Income tax effect (361) (368) (667) (589)
Other comprehensive income (loss), net of income tax effect 947 (11,900) 5,211 (5,080)
Ending balance 1,746,865 1,456,652 1,746,865 1,456,652
Unrealized Gains (Losses) on Available for Sale Securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (132,305) (156,276) (136,569) (163,096)
Unrealized gains (losses) arising during period, before tax (851) (17,401) 3,629 (9,131)
Income tax effect 219 4,420 (919) 2,319
Other comprehensive income (loss) before reclassifications (632) (12,981) 2,710 (6,812)
Reclassification adjustments for (gains) losses included in net income, before tax 719 0 749 0
Income tax effect (185) 0 (193) 0
Amounts reclassified from accumulated other comprehensive income (loss) to net income 534 0 556 0
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity 1,406 1,449 2,612 2,321
Income tax effect (361) (368) (667) (589)
Amortization of unrealized loss on securities transferred from available for sale to held to maturity 1,045 1,081 1,945 1,732
Other comprehensive income (loss), net of income tax effect 947 (11,900) 5,211 (5,080)
Ending balance $ (131,358) $ (168,176) $ (131,358) $ (168,176)