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Goodwill and Other Intangible Assets - Summary of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Balance of intangible assets, Gross CDI Carrying Amount, Beginning of period | $ 93,297 | $ 93,297
Balance of intangible assets, Gross CDI Carrying Amount, End of period | 93,297 | 93,297
Estimated Amortization Expense: |  |
Estimated Amortization Expense, 2021 | 8,240 |
Estimated Amortization Expense, 2022 | 7,126 |
Estimated Amortization Expense, 2023 | 6,010 |
Estimated Amortization Expense, 2024 | 4,892 |
Estimated Amortization Expense, 2025 | 3,773 |
Estimated Amortization Expense, Thereafter | 3,593 |
Total | 33,634 | 42,986
Balance of intangible assets, Accumulated Amortization, Beginning of period | (50,311) | (39,513)
Amortization | (9,352) | (10,798)
Balance of intangible assets, Accumulated Amortization, End of period | (59,663) | (50,311)
Balance of intangible assets, Net CDI Amount, Beginning of period | 42,986 | 53,784
Amortization | (9,352) | (10,798)
Balance of intangible assets, Net CDI Amount, End of period | $ 33,634 | $ 42,986

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