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Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net Investment Income [Line Items]
Total interest income from available-for-sale securities	$ 10,118	$ 11,697	$ 20,763	$ 23,565
Total interest income from held-to-maturity securities	4,426	4,807	8,951	9,572
Total investment income	14,544	16,504	29,714	33,137
Investment securities available-for-sale [Member]
Net Investment Income [Line Items]
Taxable	9,821	11,290	20,130	22,735
Tax-advantaged	297	407	633	830
Investment securities held-to-maturity [Member]
Net Investment Income [Line Items]
Taxable	2,932	3,048	5,842	5,926
Tax-advantaged	$ 1,494	$ 1,759	$ 3,109	$ 3,646

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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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