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Goodwill and Other Intangible Assets - Estimated Amortization Expense of Mortgage Servicing Rights (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2017 $ 2,829
2018 2,114
2019 1,565
2020 1,200
2021 923
Thereafter 1,535
Mortgage Servicing Rights [Member]  
Finite-Lived Intangible Assets [Line Items]  
2017 941
2018 825
2019 716
2020 619
2021 533
Thereafter $ 2,851