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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Security
$ / shares
Sep. 30, 2018
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
$ / shares
Mar. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Sep. 30, 2017
USD ($)
$ / shares
Jun. 30, 2017
USD ($)
$ / shares
Mar. 31, 2017
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
Branch
Segment
Security
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Business and Organization [Abstract]                      
Number of full service banking offices | Branch                 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  
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 648       578       $ 648 $ 578  
Income Taxes [Abstract]                      
Federal corporate tax rate                 21.00% 35.00% 35.00%
Net deferred tax asset                   $ 1,531  
Advertising Costs [Abstract]                      
Advertising cost                 $ 361 343 $ 356
Recent Accounting Pronouncements - Adopted [Abstract]                      
Cumulative effect adjustment from accumulated other comprehensive income to retained earnings 1       0       1 0  
Salaries and employee benefits                 19,094 17,655 16,533
Other noninterest expenses                 6,170 5,822 6,522
Basic earnings per share computation [Abstract]                      
Net income applicable to common stock $ 4,515 $ 4,581 $ 4,691 $ 4,247 $ 2,604 $ 3,650 $ 3,468 $ 3,303 $ 18,034 $ 13,025 $ 12,638
Weighted average common shares outstanding (in shares) | shares                 3,505,218 3,515,638 3,541,769
Earnings per share - basic (in dollars per share) | $ / shares $ 1.29 $ 1.31 $ 1.34 $ 1.20 $ 0.74 $ 1.04 $ 0.99 $ 0.93 $ 5.14 $ 3.70 $ 3.57
Diluted earnings per share computation [Abstract]                      
Net income applicable to common stock $ 4,515 $ 4,581 $ 4,691 $ 4,247 $ 2,604 $ 3,650 $ 3,468 $ 3,303 $ 18,034 $ 13,025 $ 12,638
Weighted average common shares outstanding for basic earnings per share (in shares) | shares                 3,505,218 3,515,638 3,541,769
Add: Dilutive effects of restricted stock (in shares) | shares                 1,988 1,724 1,556
Weighted average common shares outstanding for dilutive earnings per share (in shares) | shares                 3,507,206 3,517,362 3,543,325
Earnings per share - dilutive (in dollars per share) | $ / shares $ 1.29 $ 1.31 $ 1.34 $ 1.20 $ 0.74 $ 1.04 $ 0.99 $ 0.93 $ 5.14 $ 3.70 $ 3.57
Minimum [Member]                      
Allowance for Loan Losses [Abstract]                      
Number of days past for loan to be considered impaired                 90 days    
ASU 2017-07 [Member]                      
Recent Accounting Pronouncements - Adopted [Abstract]                      
Salaries and employee benefits                   $ (199,000) $ (123,000)
Other noninterest expenses                   199,000 123,000
ASU 2016-02 [Member] | Plan [Member]                      
Recent Accounting Pronouncements - Not yet effective [Abstract]                      
Right to use asset $ 1,500               $ 1,500    
Lease liability $ 1,500               $ 1,500    
Furniture, Fixtures and Equipment [Member] | Minimum [Member]                      
Premises and Equipment [Abstract]                      
Useful life                 3 years    
Furniture, Fixtures and Equipment [Member] | Maximum [Member]                      
Premises and Equipment [Abstract]                      
Useful life                 15 years    
Building Premises [Member] | Minimum [Member]                      
Premises and Equipment [Abstract]                      
Useful life                 5 years    
Building Premises [Member] | Maximum [Member]                      
Premises and Equipment [Abstract]                      
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    
Retained Earnings [Member]                      
Recent Accounting Pronouncements - Adopted [Abstract]                      
Cumulative effect adjustment from accumulated other comprehensive income to retained earnings         $ (1)         (1)  
Basic earnings per share computation [Abstract]                      
Net income applicable to common stock                 $ 18,034 13,025 12,638
Diluted earnings per share computation [Abstract]                      
Net income applicable to common stock                 $ 18,034 13,025 $ 12,638
Retained Earnings [Member] | ASU 2016-01 [Member]                      
Recent Accounting Pronouncements - Adopted [Abstract]                      
Cumulative effect adjustment from accumulated other comprehensive income to retained earnings         (1,000)         (1,000)  
Accumulated Other Comprehensive Income (Loss) [Member]                      
Recent Accounting Pronouncements - Adopted [Abstract]                      
Cumulative effect adjustment from accumulated other comprehensive income to retained earnings         1         1  
Accumulated Other Comprehensive Income (Loss) [Member] | ASU 2016-01 [Member]                      
Recent Accounting Pronouncements - Adopted [Abstract]                      
Cumulative effect adjustment from accumulated other comprehensive income to retained earnings         $ 1,000         $ 1,000  
Restricted Stock [Member]                      
Antidilutive Securities [Abstract]                      
Antidilutive restricted stock excluded from net income per share calculations (in shares) | shares                 3,201 3,403 3,087
Restricted Stock [Member] | Minimum [Member]                      
Antidilutive Securities [Abstract]                      
Antidilutive stock share price range (in dollars per share) | $ / shares                 $ 47.81 $ 46.69 $ 46.69
Restricted Stock [Member] | Maximum [Member]                      
Antidilutive Securities [Abstract]                      
Antidilutive stock share price range (in dollars per share) | $ / shares                 $ 61.04 $ 53.15 $ 53.15