Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net Investment Income [Line Items]
Investment securities available-for-sale	$ 17,042	$ 9,410	$ 29,874	$ 18,569
Total interest income from held-to-maturity securities	11,714	5,130	22,377	9,070
Total investment income	28,756	14,540	52,251	27,639
Investment securities available-for-sale [Member]
Net Investment Income [Line Items]
Taxable	16,863	9,226	29,512	18,194
Tax-advantaged	179	184	362	375
Investment securities available-for-sale	17,042	9,410	29,874	18,569
Investment securities held-to-maturity [Member]
Net Investment Income [Line Items]
Taxable	9,978	4,007	19,082	6,818
Tax-advantaged	1,736	1,123	3,295	2,252
Total interest income from held-to-maturity securities	$ 11,714	$ 5,130	$ 22,377	$ 9,070

Interest income from available for sale securities.

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Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities.

+ References

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on held-to-maturity 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.

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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.

+ 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)

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