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Loans and Allowance for Credit Losses - Loans Modified as Troubled Debt Restructurings During Period (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) Modification | Dec. 31, 2019 USD ($) Modification
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Number | Modification | 11 | 13
Financing Receivables, Modifications during Period, Balance | $ | $ 6,031 | $ 1,816
Real Estate Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Number | Modification | 6 | 6
Financing Receivables, Modifications during Period, Balance | $ | $ 3,709 | $ 1,638
Residential Properties | Real Estate Loan | 1-4 Family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Number | Modification | 2 | 3
Financing Receivables, Modifications during Period, Balance | $ | $ 87 | $ 131
Commercial Real Estate | Real Estate Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Number | Modification | 4 | 3
Financing Receivables, Modifications during Period, Balance | $ | $ 3,622 | $ 1,507
Agricultural Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Number | Modification | 0 | 1
Financing Receivables, Modifications during Period, Balance | $ |  | $ 40
Commercial and Industrial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Number | Modification | 4 | 5
Financing Receivables, Modifications during Period, Balance | $ | $ 2,314 | $ 127
Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Number | Modification | 1 | 1
Financing Receivables, Modifications during Period, Balance | $ | $ 8 | $ 11

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