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Mortgage Servicing Assets - Estimated Amortization Expense (Detail) - Mortgage Servicing Assets [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]        
2018 $ 501      
2019 434      
2020 367      
2021 300      
2022 232      
Thereafter 291      
Total $ 2,125 $ 2,271 $ 2,040 $ 2,072