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Loans and Allowance for Credit Losses - Troubled debt restructurings (TDRs) (Details) $ in Thousands | Mar. 31, 2022 USD ($) contract | Dec. 31, 2021 USD ($) contract
--- | --- | ---
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 50 | 64
Financing Receivable, Troubled Debt Restructuring | $ | $ 3,730 | $ 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 | $ | $ 12 | $ 15
One- to four-family residential construction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 18 | 22
Financing Receivable, Troubled Debt Restructuring | $ | $ 1,609 | $ 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 | $ | $ 1,774 | $ 1,811
Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 29 | 39
Financing Receivable, Troubled Debt Restructuring | $ | $ 335 | $ 387
Accruing |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 24 | 38
Financing Receivable, Troubled Debt Restructuring | $ | $ 898 | $ 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 | $ | $ 12 | $ 15
Accruing | One- to four-family residential construction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 7 | 10
Financing Receivable, Troubled Debt Restructuring | $ | $ 616 | $ 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 | 16 | 26
Financing Receivable, Troubled Debt Restructuring | $ | $ 270 | $ 323
Non-accruing |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 26 | 26
Financing Receivable, Troubled Debt Restructuring | $ | $ 2,832 | $ 2,849
Non-accruing | One- to four-family residential construction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 11 | 12
Financing Receivable, Troubled Debt Restructuring | $ | $ 993 | $ 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 | $ | $ 1,774 | $ 1,726
Non-accruing | Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | contract | 13 | 13
Financing Receivable, Troubled Debt Restructuring | $ | $ 65 | $ 64

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