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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of TDR Modification Type (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($) loan	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0	1	1
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 0	$ 1,800	$ 5,000
Extension of Maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			1	1
Post-Modification Outstanding Recorded Investment | $			$ 1,800	$ 5,000
Consumer | Single family residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0		1
Post-Modification Outstanding Recorded Investment | $	$ 0		$ 1,800
Consumer | Single family residential mortgage | Extension of Maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			1
Post-Modification Outstanding Recorded Investment | $			$ 1,800
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			1	1
Post-Modification Outstanding Recorded Investment | $			$ 1,800	$ 5,000
Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		0		1
Post-Modification Outstanding Recorded Investment | $		$ 0		$ 5,000
Commercial | Commercial and industrial | Extension of Maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan				1
Post-Modification Outstanding Recorded Investment | $				$ 5,000

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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Amount, after troubled debt restructuring, of modified financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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