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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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

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