COMMITMENTS, CONTINGENCIES AND DERIVATIVES (Schedule of customer loan swaps) (Details) $ in Thousands	Mar. 31, 2019 USD ($) derivative	Dec. 31, 2018 USD ($) derivative
Derivative [Line Items]
Derivative, fair value	$ 98	$ 15
Interest rate swaps
Derivative [Line Items]
Notional amount of derivative	43,000	43,000
Derivative, fair value	$ (6,711)	$ (5,682)
Interest rate swaps | Federal home loan bank 30-day
Derivative [Line Items]
Derivative, Number of Instruments Held | derivative	46	25
Notional amount of derivative	$ 251,477	$ 118,891
Derivative, fair value	7,722	3,467
Forward-Starting Interest Rate Swap
Derivative [Line Items]
Notional amount of derivative	$ 0	$ 25,000
Commercial and Industrial Sector [Member] | Interest rate swaps
Derivative [Line Items]
Derivative, Number of Instruments Held | derivative	82	82
Notional amount of derivative	$ 401,290	$ 416,515
Derivative, fair value	$ (4,402)	$ 4,374
Loans [Member] | Interest rate swaps
Derivative [Line Items]
Derivative, Number of Instruments Held | derivative	164	164
Notional amount of derivative	$ 802,580	$ 833,030
Derivative, fair value	$ 0	$ 0
Other Liabilities [Member] | Interest rate swaps | Federal home loan bank 30-day
Derivative [Line Items]
Derivative, Number of Instruments Held | derivative	36	57
Notional amount of derivative	$ 149,813	$ 297,624
Derivative, fair value	$ (3,320)	$ (7,841)