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Loans and Allowance for Credit Losses - Troubled debt restructurings (TDRs) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | 64 |
Financing Receivable, Troubled Debt Restructuring | $ 3,851 | $ 3,321
Construction and land development |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | 1 |
Financing Receivable, Troubled Debt Restructuring | $ 15 | 20
One- to four-family residential construction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | 22 |
Financing Receivable, Troubled Debt Restructuring | $ 1,638 | 1,899
Commercial Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | 2 |
Financing Receivable, Troubled Debt Restructuring | $ 1,811 | 646
Commercial business |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring |  | 127
Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | 39 |
Financing Receivable, Troubled Debt Restructuring | $ 387 | 629
Accruing |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | 38 |
Financing Receivable, Troubled Debt Restructuring | $ 1,002 |
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 | 1 |
Financing Receivable, Troubled Debt Restructuring | $ 15 |
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 | 10 |
Financing Receivable, Troubled Debt Restructuring | $ 579 |
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 | 1 |
Financing Receivable, Troubled Debt Restructuring | $ 85 |
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 | 26 |
Financing Receivable, Troubled Debt Restructuring | $ 323 |
Financing Receivable, Troubled Debt Restructuring, Accruing Interest |  | 511
Non-accruing |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | 26 |
Financing Receivable, Troubled Debt Restructuring | $ 2,849 | 971
Non-accruing | One- to four-family residential construction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | 12 |
Financing Receivable, Troubled Debt Restructuring | $ 1,059 | 778
Non-accruing | Commercial Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | 1 |
Financing Receivable, Troubled Debt Restructuring | $ 1,726 |
Non-accruing | Commercial business |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring |  | 75
Non-accruing | Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | 13 |
Financing Receivable, Troubled Debt Restructuring | $ 64 | $ 118

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