COMMITMENTS, CONTINGENCIES AND DERIVATIVES (Schedule of customer loan swaps) (Details) $ in Thousands		Mar. 31, 2018 USD ($) derivative	Dec. 31, 2017 USD ($) derivative
Derivative [Line Items]
Derivative, Number of Instruments Held | derivative		2
Derivative, fair value		$ 123	$ 142
Interest rate swaps
Derivative [Line Items]
Notional amount of derivative		43,000	43,000
Derivative, fair value	[1]	$ 5,877	$ 7,571
Interest rate swaps | Federal home loan bank 30-day
Derivative [Line Items]
Derivative, Number of Instruments Held | derivative		6	23
Notional amount of derivative		$ 19,763	$ 124,784
Derivative, fair value		402	1,799
Forward-Starting Interest Rate Swap
Derivative [Line Items]
Notional amount of derivative		25,000	50,000
Derivative, fair value	[2]	$ 85	$ 21
Commercial and Industrial Sector [Member] | Interest rate swaps
Derivative [Line Items]
Derivative, Number of Instruments Held | derivative		69	65
Notional amount of derivative		$ 354,158	$ 351,668
Derivative, fair value		$ 10,305	$ 3,237
Loans [Member] | Interest rate swaps
Derivative [Line Items]
Derivative, Number of Instruments Held | derivative		138	130
Notional amount of derivative		$ 708,316	$ 703,336
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		63	42
Notional amount of derivative		$ 334,395	$ 226,884
Derivative, fair value		$ (10,707)	$ (5,036)

[1] Presented within accrued interest and other liabilities on the consolidated statements of condition.

[2] Presented within accrued interest and other liabilities on the consolidated statements of condition.