EQUITY INCENTIVE PLANS - Restricted Stock and Additional Disclosures (Details)	9 Months Ended
	Sep. 30, 2016 USD ($) item $ / shares shares	Sep. 30, 2015 USD ($)
Number of Shares
Outstanding at beginning of year (in shares) | shares	44,866
Outstanding at end of period (in shares) | shares	46,449
Additional Disclosures
Number of equity incentive plans | item	2
Stock Options
Additional Disclosures
Unrecognized share-based compensation expense related to non-vested options (in dollars) | $	$ 342,000
Weighted average period for recognition of share-based compensation	3 years 2 months 12 days
Share-based compensation expense recognized (in dollars) | $	$ 92,000	$ 66,000
Tax benefit from recognized compensation expense (in dollars) | $	$ 12,000	9,000
Restricted stock award
Number of Shares
Outstanding at beginning of year (in shares) | shares	44,866
Granted (in shares) | shares	16,500
Vested (in shares) | shares	(14,917)
Outstanding at end of period (in shares) | shares	46,449
Weighted Average Grant Date Value
Outstanding at beginning of year (in dollars per share) | $ / shares	$ 15.21
Granted (in dollars per share) | $ / shares	19.40
Vested (in dollars per share) | $ / shares	14.27
Outstanding at end of period (in dollars per share) | $ / shares	$ 17.00
Additional Disclosures
Unrecognized share-based compensation expense related to non-vested restricted stock (in dollars) | $	$ 640,000
Share-based compensation expense recognized (in dollars) | $	191,000,000	155,000
Tax benefit from recognized compensation expense (in dollars) | $	$ 76,000,000	$ 62,000