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Mortgage Servicing Assets - Estimated Amortization Expense (Detail) - Mortgage Servicing Assets [Member] - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]        
2017 $ 536      
2018 465      
2019 393      
2020 320      
2021 248      
Thereafter 309      
Total $ 2,271 $ 2,040 $ 2,072 $ 2,356