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Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance $ 1,638,394 $ 1,402,961
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity 1,206 872
Income tax effect (306) (221)
Other comprehensive income (loss), net of income tax effect 4,264 6,820
Ending balance 1,691,617 1,421,020
Unrealized Gains (Losses) on Available for Sale Securities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (136,569) (163,096)
Unrealized gains (losses) arising during period, before tax 4,480 8,270
Income tax effect (1,138) (2,101)
Other comprehensive income (loss) before reclassifications 3,342 6,169
Reclassification adjustments for (gains) losses included in net income, before tax 30 0
Income tax effect (8) 0
Amounts reclassified from accumulated other comprehensive income (loss) to net income 22 0
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity 1,206 872
Income tax effect (306) (221)
Amortization of unrealized loss on securities transferred from available for sale to held to maturity 900 651
Other comprehensive income (loss), net of income tax effect 4,264 6,820
Ending balance $ (132,305) $ (156,276)