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Loans and Allowance - Summary of Troubled Debt Restructurings (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Pre-Modification Recorded Balance | $ 4,413 | $ 692
Post-Modification Recorded Balance | $ 4,473 | $ 690
Number of Loans | loan | 49 | 13
Commercial and industrial loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Pre-Modification Recorded Balance | $ 654 |
Post-Modification Recorded Balance | $ 654 |
Number of Loans | loan | 3 |
Agricultural land, production and other loans to farmers |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Pre-Modification Recorded Balance | $ 458 |
Post-Modification Recorded Balance | $ 458 |
Number of Loans | loan | 1 |
Construction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Pre-Modification Recorded Balance | $ 113 |
Post-Modification Recorded Balance | $ 123 |
Number of Loans | loan | 1 |
Commercial real estate, owner occupied |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Pre-Modification Recorded Balance | $ 107 |
Post-Modification Recorded Balance | $ 107 |
Number of Loans | loan | 1 |
Residential |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Pre-Modification Recorded Balance | $ 2,730 | $ 636
Post-Modification Recorded Balance | $ 2,780 | $ 629
Number of Loans | loan | 38 | 11
Home equity |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Pre-Modification Recorded Balance | $ 332 | $ 56
Post-Modification Recorded Balance | $ 332 | $ 61
Number of Loans | loan | 3 | 2
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Pre-Modification Recorded Balance | $ 19 |
Post-Modification Recorded Balance | $ 19 |
Number of Loans | loan | 2 |

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