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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ in Thousands	1 Months Ended	9 Months Ended
	Sep. 30, 2021 USD ($) branch	Sep. 30, 2021 USD ($) branch	Sep. 30, 2020 USD ($)
Accounting Policies [Abstract]
Number of banking offices | branch		33
Number of branches under sale-leaseback transactions | branch	1	1
Sale leaseback transaction, net book value	$ 4,200
Gain on sale-leaseback of branch	$ 841	$ 841	$ 0
Lessor, operating lease, term of contract	5 years	5 years
Operating lease right of use assets recognized	$ 811

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Number of offices included in Nature of Operations disclosure.

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- Definition

Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of lease income from variable lease payments, interest income from net investment on sales-type lease, and profit (loss) recognized at commencement.

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Amount of profit (loss) recognized at commencement from sales-type lease.

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