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Loans and Allowance for Credit Losses - Troubled debt restructurings (TDRs) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) contract | Dec. 31, 2021 USD ($) contract
Loans and Allowance for Credit Losses |  |
TDR Loans, Number | contract | 36 | 64
TDR loans, Balance | $ 2,949,000 | $ 3,851,000
Consumer |  |
Loans and Allowance for Credit Losses |  |
TDR Loans, Number | contract | 18 | 39
TDR loans, Balance | $ 252,000 | $ 387,000
Commercial real estate |  |
Loans and Allowance for Credit Losses |  |
TDR Loans, Number | contract | 2 | 2
TDR loans, Balance | $ 1,571,000 | $ 1,811,000
Construction and Land Development [Member] |  |
Loans and Allowance for Credit Losses |  |
TDR Loans, Number | contract |  | 1
TDR loans, Balance |  | $ 15,000
One- to four-family construction |  |
Loans and Allowance for Credit Losses |  |
TDR Loans, Number | contract | 16 | 22
TDR loans, Balance | $ 1,126,000 | $ 1,638,000
Accruing |  |
Loans and Allowance for Credit Losses |  |
TDR Loans, Number | 26 | 38
TDR loans, Balance | $ 1,238,000 | $ 1,002,000
Accruing | Consumer |  |
Loans and Allowance for Credit Losses |  |
TDR Loans, Number | 13 | 26
TDR loans, Balance | $ 210,000 | $ 323,000
Accruing | Commercial real estate |  |
Loans and Allowance for Credit Losses |  |
TDR Loans, Number |  | 1
TDR loans, Balance |  | $ 85,000
Accruing | Construction and Land Development [Member] |  |
Loans and Allowance for Credit Losses |  |
TDR Loans, Number |  | 1
TDR loans, Balance |  | $ 15,000
Accruing | One- to four-family construction |  |
Loans and Allowance for Credit Losses |  |
TDR Loans, Number | 13 | 10
TDR loans, Balance | $ 1,028,000 | $ 579,000
Non-accruing |  |
Loans and Allowance for Credit Losses |  |
TDR Loans, Number | 10 | 26
TDR loans, Balance | $ 1,711,000 | $ 2,849,000
Non-accruing | Consumer |  |
Loans and Allowance for Credit Losses |  |
TDR Loans, Number | 5 | 13
TDR loans, Balance | $ 42,000 | $ 64,000
Non-accruing | Commercial real estate |  |
Loans and Allowance for Credit Losses |  |
TDR Loans, Number | 2 | 1
TDR loans, Balance | $ 1,571,000 | $ 1,726,000
Non-accruing | One- to four-family construction |  |
Loans and Allowance for Credit Losses |  |
TDR Loans, Number | 3 | 12
TDR loans, Balance | $ 98,000 | $ 1,059,000

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