ACCOUNTING STANDARDS RECENTLY ADOPTED OR ISSUED Revenue Recognition Standard ASC 606 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Deposit Fees and Other Service Charges	$ 48,074	$ 43,452	$ 41,911
Payment and card processing expenses	15,412	14,330	14,359
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	55,841	51,787	49,156
Payment and card processing expenses	23,179	22,665	21,604
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	(7,767)	(8,335)	(7,245)
Payment and card processing expenses	$ (7,767)	$ (8,335)	$ (7,245)