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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)

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