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Loans and Allowance for Loan Losses - Financing Receivable, Troubled Debt Restructuring (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Construction and land development |  |  |
Troubled Debt Restructuring Loans Modified Term |  |  | $ 31
Troubled Debt Restructurings Total New Modifications |  |  | 31
Commercial business |  |  |
Troubled Debt Restructuring Loans Modified Combination | $ 22 |  |
Troubled Debt Restructurings Total New Modifications | 22 |  |
Consumer other |  |  |
Troubled Debt Restructuring Loans Modified Term | 16 | $ 136 | 535
Troubled Debt Restructuring Loans Modified Combination | 1,951 |  |
Troubled Debt Restructurings Total New Modifications | 1,967 | 136 | 535
Newly Restructured Modified Loans |  |  |
Troubled Debt Restructuring Loans Interest Only |  |  | 1,348
Troubled Debt Restructuring Loans Modified Term | 16 | 136 | 566
Troubled Debt Restructuring Loans Modified Combination | 3,562 |  | 106
Troubled Debt Restructurings Total New Modifications | 3,578 | $ 136 | 2,020
Commercial Real Estate |  |  |
Troubled Debt Restructuring Loans Modified Combination | 559 |  |
Troubled Debt Restructurings Total New Modifications | 559 |  |
Commercial construction |  |  |
Troubled Debt Restructuring Loans Modified Combination |  |  | 106
Troubled Debt Restructurings Total New Modifications |  |  | 106
One- to four-family residential |  |  |
Troubled Debt Restructuring Loans Interest Only |  |  | 1,348
Troubled Debt Restructuring Loans Modified Combination | 1,030 |  |
Troubled Debt Restructurings Total New Modifications | $ 1,030 |  | $ 1,348

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