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CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) BY COMPONENT (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance $ 1,746,865 $ 1,456,652 $ 1,638,394 $ 1,402,961
Unrealized gains (losses) arising during period, before tax 32,810 23,666 36,439 14,535
Income tax effect (8,432) (6,011) (9,351) (3,692)
Other comprehensive income (loss) before reclassifications 24,378 17,655 27,088 10,843
Reclassification adjustments for (gains) losses included in net income, before tax 0 (429) 749 (429)
Income tax effect 0 109 (193) 109
Amounts reclassified from accumulated other comprehensive income (loss) to net income 0 (320) 556 (320)
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity 1,209 1,379 3,821 3,700
Income tax effect (311) (350) (978) (939)
Amortization of unrealized loss on securities transferred from available for sale to held to maturity 898 1,029 2,843 2,761
Other comprehensive income (loss), net of income tax effect 25,276 18,364 30,487 13,284
Ending balance 1,801,180 1,561,607 1,801,180 1,561,607
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (131,358) (168,176) (136,569) (163,096)
Other comprehensive income (loss), net of income tax effect 25,276 18,364 30,487 13,284
Ending balance $ (106,082) $ (149,812) $ (106,082) $ (149,812)