SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014 Security	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014 Office Segment Property Security	Dec. 31, 2013	Dec. 31, 2012
Business and Organization [Abstract]
Number of full service banking offices									17
Operating Segments [Abstract]
Number of operating segments									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	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									1
Size of family properties, maximum									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 (in hundredths)									50.00%
Derivative Financial Instruments [Abstract]
Net gain or loss recognized in earnings									0	0	0
Basic earnings per share computation [Abstract]
Net income applicable to common stock	3,476,000	3,368,000	3,365,000	3,176,000	3,296,000	3,512,000	3,280,000	3,287,000	13,385,000	13,375,000	14,215,000
Weighted average common shares outstanding (in shares)									3,038,298	3,055,034	3,085,796
Earnings per share - basic (in dollars per share)	$ 1.14	$ 1.11	$ 1.11	$ 1.05	$ 1.08	$ 1.15	$ 1.07	$ 1.08	$ 4.41	$ 4.38	$ 4.61
Diluted earnings per share computation [Abstract]
Net income applicable to common stock	3,476,000	3,368,000	3,365,000	3,176,000	3,296,000	3,512,000	3,280,000	3,287,000	13,385,000	13,375,000	14,215,000
Weighted average common shares outstanding for basic earnings per share (in shares)									3,038,298	3,055,034	3,085,796
Add: Dilutive effects of restricted stock (in shares)									1,295	1,170	1,642
Weighted average common shares outstanding for dilutive earnings per share (in shares)									3,039,593	3,056,204	3,087,438
Earnings per share - dilutive (in dollars per share)	$ 1.14	$ 1.11	$ 1.11	$ 1.04	$ 1.08	$ 1.15	$ 1.07	$ 1.08	$ 4.40	$ 4.38	$ 4.60
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)									2,248	2,555	2,621
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense									$ 0	$ 0	$ 15,000
Minimum [Member]
Allowance for Loan Losses [Abstract]
Number of days past for loan to be considered impaired, Maximum									90 days
Minimum [Member] | Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock share price range (in dollars per share)									$ 37.10	$ 34.70	$ 26.80
Minimum [Member] | Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life									3 years
Maximum [Member] | Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock share price range (in dollars per share)									$ 50.50	$ 44.50	$ 37.35
Maximum [Member] | Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life									5 years 6 months
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
Open End Loans [Member]
Loans to be Charged Off [Line Items]
Number of days past due before charge-off									180 days
Closed End Loans [Member]
Loans to be Charged Off [Line Items]
Number of days past due before charge-off									120 days
All Other Loans [Member]
Loans to be Charged Off [Line Items]
Number of days past due before charge-off									90 days