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Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Net Investment Income [Line Items] |  |  |  |
Total interest income from available-for-sale securities | $ 22,441 | $ 18,543 | $ 61,393 | $ 48,417
Total interest income from held-to-maturity securities | 13,576 | 12,834 | 41,272 | 35,211
Total interest income from investment securities | 36,017 | 31,377 | 102,665 | 83,628
Investment securities available-for-sale [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Taxable | 22,272 | 18,371 | 60,887 | 47,883
Tax-advantaged | 169 | 172 | 506 | 534
Total interest income from available-for-sale securities | 22,441 | 18,543 | 61,393 | 48,417
Investment securities held-to-maturity [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Taxable | 11,139 | 10,845 | 33,939 | 29,927
Tax-advantaged | 2,437 | 1,989 | 7,333 | 5,284
Total interest income from held-to-maturity securities | $ 13,576 | $ 12,834 | $ 41,272 | $ 35,211

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- Definition Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column E)(Footnote 4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 + Details
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