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Mortgage Servicing Rights - Summary of Estimated Future Amortization Expense for Mortgage Servicing Rights (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2018 $ 187
2019 412
2020 386
2021 360
2022 335
Thereafter 457
Total $ 2,137