Investment Securities - Additional Information (Detail) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Average life of investment grade debt securities, years	3 years 10 months 24 days
Credit-related impairment loss on investment securities held-to-maturity	$ 0	$ 0
Investment securities pledged as collateral	$ 1,660,000,000	$ 1,910,000,000
Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Average life of investment grade debt securities, years	9 years 7 months 6 days
Government Agency/GSE [Member]
Debt Securities, Available-for-sale [Line Items]
Agency bond callable	$ 89,700,000
United States [Member]
Debt Securities, Available-for-sale [Line Items]
Securities issued by U.S. government percentage	89.00%
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	11.00%

Average life of investment grade debt securities.

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- Definition

Callable securities at carrying value.

+ References

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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

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 20
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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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