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GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL AND OTHER INTANGIBLE ASSETS--Additional Information (Details) - USD ($) $ in Thousands			3 Months Ended		12 Months Ended
	Aug. 30, 2019	Apr. 01, 2018	Sep. 30, 2019	Jun. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 58,000	$ 675,643	$ 58,000	$ 676,200	$ 0	$ 57,520	$ 676,167
Intangible assets amortization					$ 11,126	$ 9,671	$ 7,359
Core Deposits
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization method					accelerated basis
Estimated weighted average life (in years)					7 years 1 month 6 days
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization method					straight-line basis
Estimated weighted average life (in years)					11 years
Finite-lived Intangible Assets Acquired	$ 39,400

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amortization method of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company. The straight-line method is the preferred amortization method, unless another method better reflects the pattern in which the asset is consumed.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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