RECENT ACCOUNTING PRONOUNCEMENTS NEW ACCOUNTING PRONOUNCEMENTS (Narrative) (Details) (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2016 USD ($) $ / shares	Mar. 31, 2016 USD ($) $ / shares	Sep. 30, 2015 USD ($) $ / shares	Sep. 30, 2016 USD ($) $ / shares	Sep. 30, 2015 USD ($) $ / shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
number of accounting changes				2
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	$ 0
Net income	$ 10,903,000	$ 8,646,000	$ 6,456,000	$ 29,165,000	$ 19,260,000
Earnings Per Share, Basic | $ / shares	$ 0.70	$ 0.56	$ 0.58	$ 1.88	$ 1.72
Earnings Per Share, Diluted | $ / shares	$ 0.70	$ 0.56	$ 0.57	$ 1.88	$ 1.71
Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income	$ 63,000	$ 312,000		$ 425,000
Earnings Per Share, Basic | $ / shares	$ 0.00	$ 0.02		$ 0.02
Earnings Per Share, Diluted | $ / shares	$ 0.00	$ 0.02		$ 0
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income				$ (72,000)
Net income				$ 29,165,000	$ 19,260,000