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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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net Investment Income [Line Items]
Total interest income from available-for-sale securities	$ 18,543	$ 9,813	$ 48,417	$ 28,382
Total interest income from held-to-maturity securities	12,834	5,188	35,211	14,258
Total investment income	31,377	15,001	83,628	42,640
Investment securities available-for-sale [Member]
Net Investment Income [Line Items]
Taxable	18,371	9,630	47,883	27,824
Tax-advantaged	172	183	534	558
Total interest income from available-for-sale securities	18,543	9,813	48,417	28,382
Investment securities held-to-maturity [Member]
Net Investment Income [Line Items]
Taxable	10,845	4,099	29,927	10,917
Tax-advantaged	1,989	1,089	5,284	3,341
Total interest income from held-to-maturity securities	$ 12,834	$ 5,188	$ 35,211	$ 14,258

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Interest income from available for sale securities.

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities subject to tax benefits. Excludes operating interest income on securities exempt from 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

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities subject to state, federal and other income tax.

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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)

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