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Goodwill and Other Intangible Assets - Additional Information (Detail)
12 Months Ended
Dec. 31, 2016
Minimum [Member]  
Finite-Lived Intangible Assets [Line Items]  
Amortization period of intangible assets, years 8 years
Maximum [Member]  
Finite-Lived Intangible Assets [Line Items]  
Amortization period of intangible assets, years 13 years
Core Deposit Intangibles [Member]  
Finite-Lived Intangible Assets [Line Items]  
Amortization period of intangible assets, years 10 years
Customer Renewal Lists [Member] | Minimum [Member]  
Finite-Lived Intangible Assets [Line Items]  
Amortization period of intangible assets, years 8 years
Customer Renewal Lists [Member] | Maximum [Member]  
Finite-Lived Intangible Assets [Line Items]  
Amortization period of intangible assets, years 13 years
Mortgage Servicing Rights [Member] | Minimum [Member]  
Finite-Lived Intangible Assets [Line Items]  
Amortization period of intangible assets, years 8 years
Mortgage Servicing Rights [Member] | Maximum [Member]  
Finite-Lived Intangible Assets [Line Items]  
Amortization period of intangible assets, years 13 years