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CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) BY COMPONENT (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 1,691,617 | $ 1,421,020 | $ 1,638,394 | $ 1,402,961
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity | 1,406 | 1,449 | 2,612 | 2,321
Income tax effect | (361) | (368) | (667) | (589)
Other comprehensive income (loss), net of income tax effect | 947 | (11,900) | 5,211 | (5,080)
Ending balance | 1,746,865 | 1,456,652 | 1,746,865 | 1,456,652
Unrealized Gains (Losses) on Available for Sale Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (132,305) | (156,276) | (136,569) | (163,096)
Unrealized gains (losses) arising during period, before tax | (851) | (17,401) | 3,629 | (9,131)
Income tax effect | 219 | 4,420 | (919) | 2,319
Other comprehensive income (loss) before reclassifications | (632) | (12,981) | 2,710 | (6,812)
Reclassification adjustments for (gains) losses included in net income, before tax | 719 | 0 | 749 | 0
Income tax effect | (185) | 0 | (193) | 0
Amounts reclassified from accumulated other comprehensive income (loss) to net income | 534 | 0 | 556 | 0
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity | 1,406 | 1,449 | 2,612 | 2,321
Income tax effect | (361) | (368) | (667) | (589)
Amortization of unrealized loss on securities transferred from available for sale to held to maturity | 1,045 | 1,081 | 1,945 | 1,732
Other comprehensive income (loss), net of income tax effect | 947 | (11,900) | 5,211 | (5,080)
Ending balance | $ (131,358) | $ (168,176) | $ (131,358) | $ (168,176)

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