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Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net Investment Income [Line Items]
Total interest income from available-for-sale securities	$ 10,049	$ 10,645
Total interest income from held-to-maturity securities	3,998	4,525
Total investment income	14,047	15,170
Investment securities available-for-sale [Member]
Net Investment Income [Line Items]
Taxable	9,825	10,309
Tax-advantaged	224	336
Total interest income from available-for-sale securities	10,049	10,645
Investment securities held-to-maturity [Member]
Net Investment Income [Line Items]
Taxable	2,698	2,910
Tax-advantaged	1,300	1,615
Total interest income from held-to-maturity securities	$ 3,998	$ 4,525

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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)
-URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260

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