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Premises and Equipment - Summary of Premises and Equipment (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Land $ 10,626 $ 10,981
Buildings and building improvements 46,985 49,475
Leasehold improvements 12,953 12,967
Furniture, fixtures and equipment 26,923 33,692
Premises and equipment, gross 97,487 107,115
Less accumulated depreciation and amortization 47,174 54,879
Premises and equipment $ 50,313 $ 52,236
Buildings and building improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 10 years  
Buildings and building improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 50 years  
Leasehold improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 10 years  
Leasehold improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 25 years  
Furniture, fixtures and equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 2 years  
Furniture, fixtures and equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 30 years