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Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net Investment Income [Line Items]
Total interest income from available-for-sale securities	$ 36,052	$ 39,330	$ 45,988
Total interest income from held-to-maturity securities	14,223	17,388	18,901
Total investment income	50,275	56,718	64,889
Investment securities available-for-sale [Member]
Net Investment Income [Line Items]
Taxable	35,129	38,189	44,423
Tax-advantaged	923	1,141	1,565
Total interest income from available-for-sale securities	36,052	39,330	45,988
Investment securities held-to-maturity [Member]
Net Investment Income [Line Items]
Taxable	9,542	11,498	11,848
Tax-advantaged	4,681	5,890	7,053
Total interest income from held-to-maturity securities	$ 14,223	$ 17,388	$ 18,901

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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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