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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) | 3 Months Ended | 12 Months Ended
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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

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