Investment Securities - Additional Information (Detail) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Average life of investment grade debt securities, years	2 years 7 months 6 days
Credit-related impairment loss on investment securities held-to-maturity	$ 0	$ 0
Investment securities pledged as collateral	1,810,000,000	$ 1,640,000,000
Investment in FHLB stock, impairment losses	$ 0
Debt securities weighted average remaining contractual maturity term	18 years
Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Average life of investment grade debt securities, years	10 years 2 months 12 days
United States [Member]
Debt Securities, Available-for-sale [Line Items]
Securities issued by U.S. government percentage	93.00%
CMO/REMIC - Residential [Member]
Debt Securities, Available-for-sale [Line Items]
Investment contractual cash flows guaranteed by Government, percentage	100.00%
Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Total investment portfolio representing municipal bonds, percentage	7.00%

Average life of investment grade debt securities.

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Debt securities weighted average remaining contractual maturity term.

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Investment contractual cash flows guaranteed by government.

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Percentage of total investment portfolio representing municipal bonds.

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Securities issued by government or government sponsored agencies and enterprises percentage.

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Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount before tax of other than temporary impairment (OTTI) on investment in held-to-maturity debt security, recognized in other comprehensive loss, attributable to parent entity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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