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Goodwill and Other Intangible Assets - Estimated Amortization Expense of Servicing Rights (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2018 $ 2,114
2019 1,565
2020 1,200
2021 923
2022 666
Thereafter 868
Servicing Rights [Member]  
Finite-Lived Intangible Assets [Line Items]  
2018 970
2019 841
2020 729
2021 628
2022 541
Thereafter $ 2,864