GOODWILL AND OTHER INTANGIBLE ASSETS (Gross Carrying Amouns and Accumulated Amortization of Intangible Assets and Goodwill) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 12,156,000	$ 12,156,000
Accumulated Amortization	(3,834,000)	(2,368,000)
Net Carrying Amount	8,322,000	9,788,000
Goodwill	347,149,000	347,149,000
Goodwill	347,149,000	347,149,000
Core deposits [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,678,000	10,678,000
Accumulated Amortization	(3,252,000)	(1,941,000)
Net Carrying Amount	$ 7,426,000	$ 8,737,000
Finite-Lived Intangible Asset, Useful Life	8 years 3 months 18 days	9 years
Other Identifiable Intangible Assets
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,478,000	$ 1,478,000
Accumulated Amortization	(582,000)	(427,000)
Net Carrying Amount	$ 896,000	$ 1,051,000
Finite-Lived Intangible Asset, Useful Life	9 years 10 months 24 days	10 years 7 months 6 days