ACCOUNTING STANDARDS RECENTLY ISSUED OR ADOPTED Revenue Recognition Standard ASC 606 (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Deposit Fees and Other Service Charges	$ 11,985	$ 11,165	$ 23,281	$ 21,553
Payment and card processing expenses	3,731	3,719	7,431	6,942
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	13,909	13,238	27,010	25,423
Payment and card processing expenses	5,655	5,792	11,160	10,812
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	(1,924)	(2,073)	(3,729)	(3,870)
Payment and card processing expenses	$ (1,924)	$ (2,073)	$ (3,729)	$ (3,870)