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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)

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