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PREMISES AND EQUIPMENT - Summary of Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Bank premises and equipment, gross $ 68,682 $ 63,412
Less accumulated depreciation and amortization 30,481 28,603
Bank premises and equipment, net 38,201 34,809
Land    
Property, Plant and Equipment [Line Items]    
Bank premises and equipment, gross 7,825 7,664
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Bank premises and equipment, gross 31,987 31,154
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Bank premises and equipment, gross 3,926 2,482
Furniture and equipment    
Property, Plant and Equipment [Line Items]    
Bank premises and equipment, gross 22,998 22,023
Construction in progress    
Property, Plant and Equipment [Line Items]    
Bank premises and equipment, gross $ 1,946 $ 89