GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 985,072	$ 506,206	$ 506,206
Other Intangible Assets	32,772	23,107
Total goodwill and other intangible assets	1,017,844	529,313
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets	27,053	22,215
Other identifiable Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets	$ 5,719	$ 892