RECENT ACCOUNTING PRONOUNCEMENTS NEW ACCOUNTING PRONOUNCEMENTS (Narrative) (Details) (Details)	3 Months Ended			6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares	Mar. 31, 2016 USD ($) $ / shares	Jun. 30, 2015 USD ($) $ / shares	Jun. 30, 2016 USD ($) $ / shares	Jun. 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	$ 9,616,000	$ 8,646,000	$ 7,193,000	$ 18,262,000	$ 12,804,000
Earnings Per Share, Basic | $ / shares	$ 0.93	$ 0.84	$ 0.97	$ 1.77	$ 1.72
Earnings Per Share, Diluted | $ / shares	$ 0.92	$ 0.84	$ 0.96	$ 1.76	$ 1.71
Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income	$ 50,000	$ 312,000		$ 362,000
Earnings Per Share, Basic | $ / shares	$ 0.03	$ 0.03		$ 0.03
Earnings Per Share, Diluted | $ / shares	$ 0.00	$ 0.03		$ 0.00
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				$ 18,262,000	$ 12,804,000