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PREMISES AND EQUIPMENT - Summary of Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Total $ 61,162 $ 53,411
Less accumulated depreciation and amortization 26,291 29,451
Bank premises and equipment, net 34,871 23,960
Land    
Property, Plant and Equipment [Line Items]    
Total 7,717 5,182
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Total 30,626 23,367
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total 1,719 651
Furniture and equipment    
Property, Plant and Equipment [Line Items]    
Total 21,032 24,086
Construction in progress    
Property, Plant and Equipment [Line Items]    
Total $ 68 $ 125