LOANS AND ALLOWANCE FOR CREDIT LOSSES - Troubled debt restructurings (TDRs) (Details) $ in Thousands	Jun. 30, 2022 USD ($) contract	Dec. 31, 2021 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	44	64
Financing Receivable, Troubled Debt Restructuring | $	$ 3,605	$ 3,851
Construction and land development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	1	1
Financing Receivable, Troubled Debt Restructuring | $	$ 11	$ 15
One- to four-family residential construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	17	22
Financing Receivable, Troubled Debt Restructuring | $	$ 1,488	$ 1,638
Commercial Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	2	2
Financing Receivable, Troubled Debt Restructuring | $	$ 1,821	$ 1,811
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	24	39
Financing Receivable, Troubled Debt Restructuring | $	$ 285	$ 387
Accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	27	38
Financing Receivable, Troubled Debt Restructuring | $	$ 1,152	$ 1,002
Accruing | Construction and land development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	1	1
Financing Receivable, Troubled Debt Restructuring | $	$ 11	$ 15
Accruing | One- to four-family residential construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	11	10
Financing Receivable, Troubled Debt Restructuring | $	$ 899	$ 579
Accruing | Commercial Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract		1
Financing Receivable, Troubled Debt Restructuring | $		$ 85
Accruing | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	15	26
Financing Receivable, Troubled Debt Restructuring | $	$ 242	$ 323
Non-accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	17	26
Financing Receivable, Troubled Debt Restructuring | $	$ 2,453	$ 2,849
Non-accruing | One- to four-family residential construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	6	12
Financing Receivable, Troubled Debt Restructuring | $	$ 589	$ 1,059
Non-accruing | Commercial Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	2	1
Financing Receivable, Troubled Debt Restructuring | $	$ 1,821	$ 1,726
Non-accruing | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	9	13
Financing Receivable, Troubled Debt Restructuring | $	$ 43	$ 64