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Goodwill and Other Intangible Assets - Estimated Amortization Expense of Mortgage Servicing Rights (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2016 $ 1,871
2017 1,544
2018 1,170
2019 847
2020 577
Thereafter 734
Mortgage Servicing Rights [Member]  
Finite-Lived Intangible Assets [Line Items]  
2016 902
2017 783
2018 672
2019 574
2020 489
Thereafter $ 2,457