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v3.23.2

Changes in Accumulated Other Comprehensive Income (Loss) By Component (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 1,421,020 | $ 1,377,406 | $ 1,402,961 | $ 1,366,217
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity | 1,449 | 0 | 2,321 | 0
Income tax effect | (368) | 0 | (589) | 0
Other comprehensive income (loss), net of income tax effect | (11,900) | (62,333) | (5,080) | (119,901)
Ending balance | 1,456,652 | 1,353,390 | 1,456,652 | 1,353,390
Unrealized Gains (Losses) on Available for Sale Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (156,276) | (62,548) | (163,096) | (4,980)
Unrealized gains (losses) arising during period, before tax | (17,401) | (88,224) | (9,131) | (167,082)
Income tax effect | 4,420 | 22,938 | 2,319 | 43,441
Other comprehensive income (loss) before reclassifications | (12,981) | (65,286) | (6,812) | (123,641)
Reclassification adjustments for (gains) losses included in net income, before tax | 0 | 3,991 | 0 | 5,054
Income tax effect | 0 | (1,038) | 0 | (1,314)
Amounts reclassified from accumulated other comprehensive income (loss) to net income | 0 | 2,953 | 0 | 3,740
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity | 1,449 | 0 | 2,321 | 0
Income tax effect | (368) | 0 | (589) | 0
Amortization of unrealized loss on securities transferred from available for sale to held to maturity | 1,081 | 0 | 1,732 | 0
Other comprehensive income (loss), net of income tax effect | (11,900) | (62,333) | (5,080) | (119,901)
Ending balance | $ (168,176) | $ (124,881) | $ (168,176) | $ (124,881)

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- Definition Amount, after tax, of adjustment from accumulated other comprehensive income (loss) for amortization of gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from transfer to investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 35 -Paragraph 10B -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481889/320-10-35-10B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A + Details
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