LOANS (Change in accretable yield on acquired loans narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan and lease losses	$ 63,850,000		$ 63,850,000		$ 61,963,000
Provision for loan losses	4,918,000	$ 4,831,000	6,553,000	$ 9,094,000
2015, 2016 and 2017 Acquisitions
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractually required payments of loans acquired	44,600,000		44,600,000
Estimated fair value of loans acquired	28,200,000		28,200,000
Allowance for loan and lease losses	0		0		$ 57,000
Provision for loan losses			64,000	$ 672,000
2015 Acquisitions | Non Impaired Purchased Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractually required payments of loans acquired	4,220,000,000		4,220,000,000
Estimated fair value of loans acquired	$ 4,120,000,000		$ 4,120,000,000