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Mortgage Servicing Rights - Summary of Estimated Future Amortization Expense for Mortgage Servicing Rights (Detail)
$ in Thousands
Dec. 31, 2020
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
For the period ending December 31, 2021 $ 382
2022 357
2023 334
2024 311
2025 285
Thereafter 137
Total $ 1,806