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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Security
$ / shares
Sep. 30, 2015
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
$ / shares
Mar. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
Sep. 30, 2014
USD ($)
$ / shares
Jun. 30, 2014
USD ($)
$ / shares
Mar. 31, 2014
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
Branches
Segment
Security
Property
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Business and Organization [Abstract]                      
Number of full service banking offices | Branches                 25    
Operating Segments [Abstract]                      
Number of operating segments | Segment                 1    
Cash and Cash Equivalents [Abstract]                      
Interest earning deposits maturity, Maximum for inclusion as cash equivalents                 90 days    
Investment Securities [Abstract]                      
Number of classifications of investment securities | Security 3               3    
Held-to-maturity securities $ 0       $ 0       $ 0 $ 0  
Trading securities 0       0       $ 0 0  
Number of years significantly below cost to recognize an impairment                 1 year    
Allowance for Loan Losses [Abstract]                      
Size of family properties, minimum | Property                 1    
Size of family properties, maximum | Property                 4    
Number of days past for loan to be considered impaired, Maximum                 90 days    
Goodwill [Abstract]                      
Goodwill impairment loss                 $ 0 0 $ 0
Bank Owned Life Insurance [Abstract]                      
Benefit in excess of the cash surrender value                 50.00%    
Derivative Financial Instruments [Abstract]                      
Net gain or loss recognized in earnings                     0
Basic earnings per share computation [Abstract]                      
Net income applicable to common stock $ 2,460,000 $ 2,857,000 $ 3,189,000 $ 3,120,000 $ 3,476,000 $ 3,368,000 $ 3,365,000 $ 3,176,000 $ 11,626,000 $ 13,385,000 $ 13,375,000
Weighted average common shares outstanding (in shares) | shares                 3,031,282 3,038,298 3,055,034
Earnings per share - basic (in dollars per share) | $ / shares $ 0.80 $ 0.95 $ 1.06 $ 1.03 $ 1.14 $ 1.11 $ 1.11 $ 1.05 $ 3.84 $ 4.41 $ 4.38
Diluted earnings per share computation [Abstract]                      
Net income applicable to common stock $ 2,460,000 $ 2,857,000 $ 3,189,000 $ 3,120,000 $ 3,476,000 $ 3,368,000 $ 3,365,000 $ 3,176,000 $ 11,626,000 $ 13,385,000 $ 13,375,000
Weighted average common shares outstanding for basic earnings per share (in shares) | shares                 3,031,282 3,038,298 3,055,034
Add: Dilutive effects of restricted stock (in shares) | shares                 1,360 1,295 1,170
Weighted average common shares outstanding for dilutive earnings per share (in shares) | shares                 3,032,642 3,039,593 3,056,204
Earnings per share - dilutive (in dollars per share) | $ / shares $ 0.79 $ 0.95 $ 1.06 $ 1.03 $ 1.14 $ 1.11 $ 1.11 $ 1.04 $ 3.83 $ 4.40 $ 4.38
Minimum [Member]                      
Allowance for Loan Losses [Abstract]                      
Number of days past for loan to be considered impaired, Maximum                 90 days    
Furniture, Fixtures and Equipment [Member] | Minimum [Member]                      
Property, Plant and Equipment [Line Items]                      
Useful life                 3 years    
Furniture, Fixtures and Equipment [Member] | Maximum [Member]                      
Property, Plant and Equipment [Line Items]                      
Useful life                 15 years    
Building Premises [Member] | Minimum [Member]                      
Property, Plant and Equipment [Line Items]                      
Useful life                 5 years    
Building Premises [Member] | Maximum [Member]                      
Property, Plant and Equipment [Line Items]                      
Useful life                 40 years    
Core Deposits [Member]                      
Finite-Lived Intangible Assets [Line Items]                      
Useful Life                 10 years    
Noncompete Agreements [Member]                      
Finite-Lived Intangible Assets [Line Items]                      
Useful Life                 4 years    
Restricted Stock [Member]                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive restricted stock excluded from net income per share calculations (in shares) | shares                 2,105 2,248 2,555
Restricted Stock [Member] | Minimum [Member]                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive stock share price range (in dollars per share) | $ / shares 50.15       37.10       $ 50.15 $ 37.10 $ 34.70
Restricted Stock [Member] | Maximum [Member]                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive stock share price range (in dollars per share) | $ / shares $ 53.15       $ 50.50       $ 53.15 $ 50.50 $ 44.50