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PREMISES AND EQUIPMENT - Summary of Bank Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Total $ 53,411 $ 51,965
Less accumulated depreciation and amortization 29,451 27,165
Bank premises and equipment, net 23,960 24,800
Land    
Property, Plant and Equipment [Line Items]    
Total 5,182 5,182
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Total 23,367 23,333
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total 651 511
Furniture and equipment    
Property, Plant and Equipment [Line Items]    
Total 24,086 22,799
Construction in progress    
Property, Plant and Equipment [Line Items]    
Total $ 125 $ 140