COMMITMENTS, CONTINGENCIES AND DERIVATIVES (Schedule of customer loan swaps) (Details) $ in Thousands	Jun. 30, 2019 USD ($) derivative	Dec. 31, 2018 USD ($) derivative
Interest rate swaps
Derivative [Line Items]
Notional amount of derivative	$ 43,000	$ 43,000
Fair Value	$ (8,306)	$ (5,682)
Interest rate swaps | Federal home loan bank 30-day
Derivative [Line Items]
Derivative, Number of Instruments Held | derivative	72	25
Notional amount of derivative	$ 366,341	$ 118,891
Fair Value	17,143	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	84	82
Notional amount of derivative	$ 409,257	$ 416,515
Fair Value	$ (16,602)	$ 4,374
Loans [Member] | Interest rate swaps
Derivative [Line Items]
Derivative, Number of Instruments Held | derivative	168	164
Notional amount of derivative	$ 818,514	$ 833,030
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	12	57
Notional amount of derivative	$ 42,916	$ 297,624
Fair Value	$ (541)	$ (7,841)