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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Troubled debt restructurings ("TDRs") (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($) contract	Dec. 31, 2020 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	75
Financing Receivable, Troubled Debt Restructuring	$ 4,047	$ 3,321
Construction and land development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	1
Financing Receivable, Troubled Debt Restructuring	$ 17	20
One- to four-family residential construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	20
Financing Receivable, Troubled Debt Restructuring	$ 1,746	1,899
Commercial Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	2
Financing Receivable, Troubled Debt Restructuring	$ 1,829	646
Commercial business
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	1
Financing Receivable, Troubled Debt Restructuring	$ 60	127
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	51
Financing Receivable, Troubled Debt Restructuring	$ 395	629
Accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	42
Financing Receivable, Troubled Debt Restructuring	$ 2,710
Financing Receivable, Troubled Debt Restructuring, Accruing Interest		2,350
Accruing | Construction and land development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	1
Financing Receivable, Troubled Debt Restructuring	$ 17
Financing Receivable, Troubled Debt Restructuring, Accruing Interest		20
Accruing | One- to four-family residential construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	7
Financing Receivable, Troubled Debt Restructuring	$ 571
Financing Receivable, Troubled Debt Restructuring, Accruing Interest		1,121
Accruing | Commercial Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	2
Financing Receivable, Troubled Debt Restructuring	$ 1,829
Financing Receivable, Troubled Debt Restructuring, Accruing Interest		646
Accruing | Commercial business
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Accruing Interest		52
Accruing | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	32
Financing Receivable, Troubled Debt Restructuring	$ 293
Financing Receivable, Troubled Debt Restructuring, Accruing Interest		511
Non-accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	33
Financing Receivable, Troubled Debt Restructuring	$ 1,337	971
Non-accruing | One- to four-family residential construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	13
Financing Receivable, Troubled Debt Restructuring	$ 1,175	778
Non-accruing | Commercial business
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	1
Financing Receivable, Troubled Debt Restructuring	$ 60	75
Non-accruing | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	19
Financing Receivable, Troubled Debt Restructuring	$ 102	$ 118

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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
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-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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