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Regulatory Matters - Additional Information (Detail) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Regulated Operations [Abstract] |  |  |
Capital conservation buffer rate | 0.625% |  |
Capital conservation buffer phase period |  | 4 years |
Capital conservation buffer rate, full implementation |  | 2.50% |
Percentage of required capital conservation buffer rate of CET1 |  | 2.50% |
Capital conservation buffer phase in beginning period |  | Jan. 01, 2016 |
Capital conservation buffer phase in end period |  | Jan. 01, 2019 |
Trust-preferred securities included in Tier 1 capital |  | $ 25.0 | $ 25.0
Additional dividends without obtaining prior approval from bank regulators declared and paid |  | $ 158.7 |

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