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Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net Investment Income [Line Items]
Total interest income from available-for-sale securities	$ 9,159	$ 10,049
Total interest income from held-to-maturity securities	3,940	3,998
Total investment income	13,099	14,047
Investment securities available-for-sale [Member]
Net Investment Income [Line Items]
Taxable	8,968	9,825
Tax-advantaged	191	224
Total interest income from available-for-sale securities	9,159	10,049
Investment securities held-to-maturity [Member]
Net Investment Income [Line Items]
Taxable	2,811	2,698
Tax-advantaged	1,129	1,300
Total interest income from held-to-maturity securities	$ 3,940	$ 3,998

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

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

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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.

+ 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)
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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.2)
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