LOANS AND LEASES (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable Recorded Investment Past Due [Line Items]
Impaired non-accrual loans	$ 24,892	$ 25,715
Impaired non-accrual loans performing troubled debt restructured	4,300	4,300
Allowance allocated to troubled debt restructured loans	258	262
Allowance allocated to non accrual loans	159	161
Loan receivable, validate risk ratings performed for new lending to existing relationships	1,000,000
Loan receivable, validate risk ratings performed for criticized and classified rated borrowers with relationship exposure, value	500,000
Loan receivable, validate risk ratings performed for random sample of borrowers with relationship, value	1,000,000
Loan receivable, validate risk ratings performed for new regulation "O" loan commitments, value	1,000,000
Troubled debt restructurings specific reserves to customers			$ 258	$ 262
Substandard [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing receivable impaired loan	$ 29,100	$ 31,200