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GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Additional Information (Details) - USD ($)			12 Months Ended
	Oct. 01, 2020	Aug. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill			$ 37,144,000	$ 37,144,000
Accumulated impairment loss			2,100,000	2,100,000
Goodwill, impairment loss	$ 0	$ 0
Impairment on intangible assets			0	0	$ 0
Amortization of intangible assets			$ 1,518,000	$ 2,195,000	$ 3,007,000
Core deposit intangibles
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period			3 years 9 months 18 days
Minimum | Core deposit intangibles
Finite-Lived Intangible Assets [Line Items]
Amortization period of other intangible assets			4 years
Maximum | Core deposit intangibles
Finite-Lived Intangible Assets [Line Items]
Amortization period of other intangible assets			10 years

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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