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GOODWILL AND OTHER INTANGIBLE ASSETS--Schedule of Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 100,597	$ 100,564
Finite-Lived Intangible Assets, Accumulated Amortization	$ (38,613)	(36,012)
Core deposits
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization method	accelerated basis
Finite-Lived Intangible Assets, Gross	$ 51,031	51,031
Finite-Lived Intangible Assets, Accumulated Amortization	$ (28,834)	(27,524)
Customer lists
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization method	straight-line basis
Finite-Lived Intangible Assets, Gross	$ 39,420	39,420
Finite-Lived Intangible Assets, Accumulated Amortization	(5,674)	(4,778)
Other
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	10,146	10,113
Finite-Lived Intangible Assets, Accumulated Amortization	$ (4,105)	$ (3,710)

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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- Definition

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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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
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