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Investment Securities - Additional Information (Detail) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items] |  |
Credit-related impairment loss on investment securities held-to-maturity | $ 0 |
Investment securities pledged as collateral | $ 1,510,000,000 | $ 1,660,000,000
United States [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities issued by U.S. government percentage | 89.00% |

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