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Mortgage Servicing Rights - Summary of Estimated Future Amortization Expense for Mortgage Servicing Rights (Detail)
$ in Thousands
Dec. 31, 2019
USD ($)
Finite Lived Intangible Assets Future Amortization Expense [Abstract]  
2020 $ 459
2021 431
2022 401
2023 373
2024 342
Thereafter 166
Total $ 2,172