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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Troubled Debt Restructuring (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) Contract	Dec. 31, 2020 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Total	$ 9,606	$ 9,716
Troubled Debt Restructurings:
Number of Contracts | Contract	1	4
Pre-Modification Outstanding Recorded Investment	$ 17	$ 2,435
Post-Modification Outstanding Recorded Investment	$ 17	$ 1,836
Commercial and industrial
Troubled Debt Restructurings:
Number of Contracts | Contract	1	1
Pre-Modification Outstanding Recorded Investment	$ 17	$ 129
Post-Modification Outstanding Recorded Investment	17	$ 85
Construction and development
Troubled Debt Restructurings:
Number of Contracts | Contract		2
Pre-Modification Outstanding Recorded Investment		$ 1,289
Post-Modification Outstanding Recorded Investment		$ 1,081
Commercial real estate
Troubled Debt Restructurings:
Number of Contracts | Contract		1
Pre-Modification Outstanding Recorded Investment		$ 1,017
Post-Modification Outstanding Recorded Investment		670
Nonaccrual TDRs
Financing Receivable, Modifications [Line Items]
Total	84	90
Performing TDRs
Financing Receivable, Modifications [Line Items]
Total	$ 9,522	$ 9,626

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Troubled Debt Restructuring [Abstract]

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Number of financing receivables that have been modified by troubled debt restructurings.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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Amount, after troubled debt restructuring, of modified financing receivable.

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Amount, before troubled debt restructuring, of financing receivable to be modified.

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