Investment Securities - Additional Information (Detail) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Average life of investment grade debt securities, years	4 years
Credit-related impairment loss on investment securities held-to-maturity	$ 0	$ 0
Investment securities pledged as collateral	1,910,000,000	$ 2,190,000,000
Investment in FHLB stock, impairment losses	$ 0
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Average life of investment grade debt securities, years	9 years 10 months 25 days
Government Agency/GSE [Member]
Schedule of Available-for-sale Securities [Line Items]
Agency bond callable	$ 101,300,000
United States [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities issued by U.S. government percentage	89.00%
CMO/REMIC - Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment contractual cash flows guaranteed by Government, percentage	100.00%

Average life of investment grade debt securities.

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Callable securities at carrying value.

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Investment contractual cash flows guaranteed by government.

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

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The fair value of available-for-sale securities that serve as collateral for borrowings.

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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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