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Investment Securities - Additional Information (Detail) - USD ($) | 12 Months Ended
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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% |

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