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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance $ 1,456,652 $ 1,353,390 $ 1,402,961 $ 1,366,217
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity 1,379 0 3,700 0
Income tax effect (350) 0 (939) 0
Other comprehensive income (loss), net of income tax effect 18,364 (31,245) 13,284 (151,146)
Ending balance 1,561,607 1,386,931 1,561,607 1,386,931
Unrealized Gains (Losses) on Available for Sale Securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (168,176) (124,881) (163,096) (4,980)
Unrealized gains (losses) arising during period, before tax 23,666 (46,450) 14,535 (213,532)
Income tax effect (6,011) 12,077 (3,692) 55,518
Other comprehensive income (loss) before reclassifications 17,655 (34,373) 10,843 (158,014)
Reclassification adjustments for (gains) losses included in net income, before tax (429) 4,227 (429) 9,281
Income tax effect 109 (1,099) 109 (2,413)
Amounts reclassified from accumulated other comprehensive income (loss) to net income (320) 3,128 (320) 6,868
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity 1,379 0 3,700 0
Income tax effect (350) 0 (939) 0
Amortization of unrealized loss on securities transferred from available for sale to held to maturity 1,029 0 2,761 0
Other comprehensive income (loss), net of income tax effect 18,364 (31,245) 13,284 (151,146)
Ending balance $ (149,812) $ (156,126) $ (149,812) $ (156,126)