Investment Securities - Additional Information (Detail) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Average life of investment grade debt securities, years	3 years 6 months
Credit-related impairment loss on investment securities held-to-maturity	$ 0	$ 0
Investment securities pledged as collateral	1,640,000,000	$ 1,660,000,000
Investment in FHLB stock, impairment losses	$ 0
Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Average life of investment grade debt securities, years	9 years
United States [Member]
Debt Securities, Available-for-sale [Line Items]
Securities issued by U.S. government percentage	90.00%
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	10.00%

Average life of investment grade debt securities.

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- Definition

Investment contractual cash flows guaranteed by government.

+ References

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- Definition

Percentage of total investment portfolio representing municipal bonds.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

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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- Definition

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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- Definition

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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- Definition

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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