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Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Net Investment Income [Line Items] |  |  |
Investment securities available-for-sale | $ 68,508 | $ 38,273 | $ 36,052
Investment securities held-to-maturity | 49,048 | 22,175 | 14,223
Total investment income | 117,556 | 60,448 | 50,275
Investment securities available-for-sale [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Taxable | 67,803 | 37,532 | 35,129
Tax-advantaged | 705 | 741 | 923
Investment securities available-for-sale | 68,508 | 38,273 | 36,052
Investment securities held-to-maturity [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Taxable | 41,403 | 17,747 | 9,542
Tax-advantaged | 7,645 | 4,428 | 4,681
Investment securities held-to-maturity | $ 49,048 | $ 22,175 | $ 14,223

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- Definition Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities subject to state, federal and other income tax. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.2) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph (a) Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph (b) -Subparagraph (1) + Details
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