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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Security
$ / shares
Sep. 30, 2017
USD ($)
$ / shares
Jun. 30, 2017
USD ($)
$ / shares
Mar. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
Sep. 30, 2016
USD ($)
$ / shares
Jun. 30, 2016
USD ($)
$ / shares
Mar. 31, 2016
USD ($)
$ / shares
Dec. 31, 2018
Dec. 31, 2017
USD ($)
Branches
Segment
Security
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Business and Organization [Abstract]                        
Number of full service banking offices | Branches                   26    
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]                        
Number of days past for loan to be considered impaired                   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%    
Obligation included in other liabilities 578,000       569,000         $ 578,000 $ 569,000  
Income Tax Disclosure [Line Items]                        
Federal corporate tax rate                   34.00% 34.00% 34.00%
Net deferred tax asset                   $ 1,531,000    
Reclassification of certain income tax effects from accumulated other comprehensive income                   0    
Advertising Costs [Abstract]                        
Advertising cost                   343,000 $ 356,000 $ 243,000
Basic earnings per share computation [Abstract]                        
Net income applicable to common stock $ 2,604,000 $ 3,650,000 $ 3,468,000 $ 3,303,000 $ 3,171,000 $ 3,153,000 $ 3,031,000 $ 3,283,000   $ 13,025,000 $ 12,638,000 $ 11,626,000
Weighted average common shares outstanding (in shares) | shares                   3,481,366 3,507,497 3,229,470
Earnings per share - basic (in dollars per share) | $ / shares $ 0.75 $ 1.05 $ 1.00 $ 0.94 $ 0.91 $ 0.90 $ 0.86 $ 0.93   $ 3.74 $ 3.60 $ 3.60
Diluted earnings per share computation [Abstract]                        
Net income applicable to common stock $ 2,604,000 $ 3,650,000 $ 3,468,000 $ 3,303,000 $ 3,171,000 $ 3,153,000 $ 3,031,000 $ 3,283,000   $ 13,025,000 $ 12,638,000 $ 11,626,000
Weighted average common shares outstanding for basic earnings per share (in shares) | shares                   3,481,366 3,507,497 3,229,470
Add: Dilutive effects of restricted stock (in shares) | shares                   1,724 1,556 1,360
Weighted average common shares outstanding for dilutive earnings per share (in shares) | shares                   3,483,090 3,509,053 3,230,830
Earnings per share - dilutive (in dollars per share) | $ / shares $ 0.75 $ 1.05 $ 1.00 $ 0.94 $ 0.91 $ 0.90 $ 0.86 $ 0.93   $ 3.74 $ 3.60 $ 3.60
Minimum [Member]                        
Allowance for Loan Losses [Abstract]                        
Number of days past for loan to be considered impaired                   90 days    
Retained Earnings [Member]                        
Income Tax Disclosure [Line Items]                        
Reclassification of certain income tax effects from accumulated other comprehensive income                   $ 559,000    
Basic earnings per share computation [Abstract]                        
Net income applicable to common stock                   13,025,000 $ 12,638,000 $ 11,626,000
Diluted earnings per share computation [Abstract]                        
Net income applicable to common stock                   13,025,000 12,638,000 $ 11,626,000
Accumulated Other Comprehensive Income (Loss) [Member]                        
Income Tax Disclosure [Line Items]                        
Reclassification of certain income tax effects from accumulated other comprehensive income                   (559,000)    
Plan [Member]                        
Income Tax Disclosure [Line Items]                        
Federal corporate tax rate                 21.00%      
Plan [Member] | Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]                        
Income Tax Disclosure [Line Items]                        
Cumulative effect adjustment from acumualted other comprehensive income to retained earnings $ (1,000,000)                 (1,000,000)    
Plan [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Accounting Standards Update 2016-01 [Member]                        
Income Tax Disclosure [Line Items]                        
Cumulative effect adjustment from acumualted other comprehensive income to retained earnings 1,000,000                 1,000,000    
Continuation of Life Insurance Plan [Member]                        
Bank Owned Life Insurance [Abstract]                        
Obligation included in other liabilities $ 578,000       $ 569,000         $ 578,000 $ 569,000  
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                   3,403 3,087 2,105
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                   $ 46.69 $ 46.69 $ 50.15
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 $ 53.15 $ 53.15