LOANS (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable Recorded Investment Past Due [Line Items]
Loans held for sale, at lower of cost or fair value	$ 3,542	$ 187
(Loss)/gain on loans held for sale at lower of cost or fair value	(4,392)	412	$ 1,233
Impaired non-accrual loans	25,715	13,530
Impaired non-accrual loans performing troubled debt restructured	4,300	9,500
Allowance allocated to troubled debt restructured loans	262	423
Allowance allocated to non accrual loans	161	173
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	262	423
Substandard [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing receivable impaired loan	31,200	21,800
Multifamily Property [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans held for sale, at lower of cost or fair value	$ 131,300		$ 234,800
Multifamily Property [Member] | Residential Portfolio Segment [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans held for sale, at lower of cost or fair value		$ 109,900