INTANGIBLE ASSETS (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended
	Apr. 30, 2019	Mar. 31, 2020	Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Impairment charges for goodwill	$ 0	$ 0
Intangible assets, amortization expense		$ 4,401	$ 4,218
Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period (years)		4 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period (years)		10 years
Core Deposits | Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period (years)		4 years
Core Deposits | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period (years)		10 years
Other Amortizable Intangibles | Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period (years)		4 years
Other Amortizable Intangibles | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period (years)		10 years
Core Deposits and Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization expense		$ 4,400	$ 4,200