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v3.23.1

Changes in Accumulated Other Comprehensive Income (Loss) By Component (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning balance | $ 1,402,961 | $ 1,366,217
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity | 872 | 0
Income tax effect | (221) | 0
Other comprehensive income (loss), net of income tax effect | 6,820 | (57,568)
Ending balance | 1,421,020 | 1,377,406
Total |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning balance | (163,096) | (4,980)
Other comprehensive income (loss), net of income tax effect | 6,820 | (57,568)
Ending balance | (156,276) | (62,548)
Unrealized Gains (Losses) on Available for Sale Securities |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning balance | (163,096) | (4,980)
Unrealized gains (losses) arising during period, before tax | 8,270 | (78,858)
Income tax effect | (2,101) | 20,503
Other comprehensive income (loss) before reclassifications | 6,169 | (58,355)
Reclassification adjustments for (gains) losses included in net income, before tax | 0 | 1,063
Income tax effect | 0 | (276)
Amounts reclassified from accumulated other comprehensive income (loss) to net income | 0 | 787
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity | 872 | 0
Income tax effect | (221) | 0
Amortization of unrealized loss on securities transferred from available for sale to held to maturity | 651 | 0
Other comprehensive income (loss), net of income tax effect | 6,820 | (57,568)
Ending balance | $ (156,276) | $ (62,548)

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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- Definition Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI https://asc.fasb.org/extlink&oid=124507222&loc=d3e1436-108581 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 10B -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=124260725&loc=SL120268667-111560 + Details
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- Definition Amount, before 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 -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 10B -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=124260725&loc=SL120268667-111560 + Details
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- Definition Amount of tax expense (benefit) on 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 -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 10B -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=124260725&loc=SL120268667-111560 + Details
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