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Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Net Investment Income [Line Items] |  |
Investment securities available-for-sale | $ 21,446 | $ 19,596
Total interest income from held-to-maturity securities | 13,402 | 13,956
Total investment income | 34,848 | 33,552
Investment securities available-for-sale [Member] |  |
Net Investment Income [Line Items] |  |
Taxable | 21,280 | 19,428
Tax-advantaged | 166 | 168
Investment securities available-for-sale | 21,446 | 19,596
Investment securities held-to-maturity [Member] |  |
Net Investment Income [Line Items] |  |
Taxable | 10,984 | 11,507
Tax-advantaged | 2,418 | 2,449
Total interest income from held-to-maturity securities | $ 13,402 | $ 13,956

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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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