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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2015
USD ($)
segment
component
office
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Accounting Policies [Line Items]      
Number of offices in which the company operates throughout the country | office 21    
Cash and cash equivalents, original maturities (or less) 90 days    
Impairment charge related to investment $ 0    
Held to maturity or trading securities $ 0 $ 0  
Number of impairment components | component 2    
Debt securities other than temporarily impaired $ 0 0 $ 0
Maturity of interest bearing deposits 90 days    
Evaluation period to return past due loans to accrual status 6 months    
Balance of loans serviced for others $ 317,793,000 315,239,000  
Foreclosed real estate totaled $ 710,000 932,000  
Percentage of limited partner interest 99.00%    
Investment in real estate partnership $ 5,450,000 3,629,000  
Investment in real estate partnerships, proportional amortization method 2,205,000    
Loss investment in real estate partnership 384,000 150,000 361,000
Recognition of federal tax credits 475,000 475,000 475,000
Advertising expense $ 723,000 540,000 $ 489,000
Percentage of deferred tax assets (more than) 50.00%    
Accumulated other comprehensive income (loss), net of taxes $ 1,199,000 $ 1,576,000  
Number of operating significant segment | segment 1    
Customer list      
Accounting Policies [Line Items]      
Finite lives of intangible assets 15 years    
Deposit premiums      
Accounting Policies [Line Items]      
Finite lives of intangible assets 10 years    
Minimum | Buildings and improvements      
Accounting Policies [Line Items]      
Plant and equipment, useful life 10 years    
Minimum | Furniture and Equipment      
Accounting Policies [Line Items]      
Plant and equipment, useful life 3 years    
Maximum | Buildings and improvements      
Accounting Policies [Line Items]      
Plant and equipment, useful life 40 years    
Maximum | Furniture and Equipment      
Accounting Policies [Line Items]      
Plant and equipment, useful life 15 years