ACCOUNTING STANDARDS RECENTLY ISSUED OR ADOPTED Revenue Recognition Standard ASC 606 (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Deposit Fees and Other Service Charges	$ 12,255	$ 11,058	$ 35,535	$ 32,611
Payment and card processing expenses	3,748	3,581	11,179	10,523
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Deposit Fees and Other Service Charges	16,799	13,316	41,434	38,739
Payment and card processing expenses	8,292	5,839	17,078	16,651
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Deposit Fees and Other Service Charges	(4,544)	(2,258)	(5,899)	(6,128)
Payment and card processing expenses	$ (4,544)	$ (2,258)	$ (5,899)	$ (6,128)