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EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Basic earnings per share [Abstract]
Income available to common stockholders									$ 12,552	$ 12,570	$ 10,155
Weighted average common shares outstanding (in shares)									8,089,720	7,997,047	7,940,892
Earnings per share (in dollars per share)	$ 0.39us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.44us-gaap_EarningsPerShareBasic	$ 0.44us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.37us-gaap_EarningsPerShareBasic	$ 0.29us-gaap_EarningsPerShareBasic	$ 1.55us-gaap_EarningsPerShareBasic	$ 1.57us-gaap_EarningsPerShareBasic	$ 1.28us-gaap_EarningsPerShareBasic
Diluted earnings per share [Abstract]
Income available to common stockholders									$ 12,552	$ 12,570	$ 10,155
Weighted average common shares outstanding (in shares)									8,089,720	7,997,047	7,940,892
Add dilutive effects of potential additional common stock (in shares)									506,576	448,202	240,611
Weighted average common and dilutive potential Common shares outstanding (in shares)									8,596,296	8,445,249	8,181,503
Earnings per share assuming dilution (in dollars per share)	$ 0.37us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted	$ 0.44us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted	$ 0.28us-gaap_EarningsPerShareDiluted	$ 1.46us-gaap_EarningsPerShareDiluted	$ 1.49us-gaap_EarningsPerShareDiluted	$ 1.24us-gaap_EarningsPerShareDiluted
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities not considered in computing diluted earnings per share (in shares)									23,500	84,100	183,699