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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Troubled debt restructurings ("TDRs") (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) contract | Dec. 31, 2020 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 66 |
Financing Receivable, Troubled Debt Restructuring | $ 3,769 | $ 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 | $ 16 | 20
One- to four-family residential construction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 18 |
Financing Receivable, Troubled Debt Restructuring | $ 1,598 | 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 | $ 1,813 | 646
Commercial business |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 1 |
Financing Receivable, Troubled Debt Restructuring | $ 52 | 127
Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 44 |
Financing Receivable, Troubled Debt Restructuring | $ 290 | 629
Accruing |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 40 |
Financing Receivable, Troubled Debt Restructuring | $ 2,587 |
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 | $ 16 |
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 | 8 |
Financing Receivable, Troubled Debt Restructuring | $ 546 |
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 | $ 1,813 |
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 | 29 |
Financing Receivable, Troubled Debt Restructuring | $ 212 |
Financing Receivable, Troubled Debt Restructuring, Accruing Interest |  | 511
Non-accruing |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 26 |
Financing Receivable, Troubled Debt Restructuring | $ 1,182 | 971
Non-accruing | One- to four-family residential construction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 10 |
Financing Receivable, Troubled Debt Restructuring | $ 1,052 | 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 | $ 52 | 75
Non-accruing | Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 15 |
Financing Receivable, Troubled Debt Restructuring | $ 78 | $ 118

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