GOODWILL AND OTHER INTANGIBLE ASSETS (Gross Carrying Amouns and Accumulated Amortization of Intangible Assets and Goodwill) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 12,156,000	$ 786,000
Accumulated Amortization	(1,288,000)	(206,000)
Net Carrying Amount	10,868,000	580,000
Goodwill	346,312,000	85,768,000
Finite-lived Intangible Assets Acquired	700,000
Other Identifiable Intangible Assets
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,478,000	786,000
Accumulated Amortization	(317,000)	(206,000)
Net Carrying Amount	$ 1,161,000	$ 580,000
Other Identifiable Intangible Assets | Weighted average [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	11 years	13 years 1 month
Core deposits [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 10,678,000	$ 0
Accumulated Amortization	(971,000)	0
Net Carrying Amount	$ 9,707,000	$ 0
Core deposits [Member] | Weighted average [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	9 years 6 months