LOANS (Change in accretable yield on acquired loans narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan and lease losses	$ 66,222		$ 66,222		$ 61,963
Provision for loan losses	5,201	$ 5,238	11,754	$ 14,332
Loans acquired since 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractually required payments of loans acquired	44,600		44,600
Estimated fair value of loans acquired	28,200		28,200
Allowance for loan and lease losses	103		103		$ 57
Provision for loan losses			39	$ 675
Loans acquired since 2015 | Non Impaired Purchased Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractually required payments of loans acquired	4,220,000		4,220,000
Estimated fair value of loans acquired	$ 4,120,000		$ 4,120,000