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Employee Benefit Plans - Summary of Estimated Future Benefit Payments (Detail) - Supplemental Employee Retirement Plan [Member]
Dec. 31, 2018
USD ($)
Defined Contribution Plan Disclosure [Line Items]  
2019 $ 512,786
2020 509,653
2021 536,643
2022 535,013
2023 545,087
2024-2028 $ 2,905,547