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Loans and Allowance for Credit Losses - Loans Modified as Troubled Debt Restructurings During Period (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 USD ($) Modification | Jun. 30, 2020 USD ($) Modification
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Number | Modification | 5 | 7
Financing Receivables, Modifications during Period, Balance | $ | $ 1,098 | $ 2,744
Real Estate Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Number | Modification | 2 | 1
Financing Receivables, Modifications during Period, Balance | $ | $ 1,074 | $ 303
Real Estate Loan | 1-4 Family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Number | Modification | 1 | 0
Financing Receivables, Modifications during Period, Balance | $ | $ 395 | $ 0
Commercial Real Estate | Real Estate Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Number | Modification | 1 | 1
Financing Receivables, Modifications during Period, Balance | $ | $ 679 | $ 303
Agricultural Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Number | Modification | 0 | 2
Financing Receivables, Modifications during Period, Balance | $ | $ 0 | $ 88
Commercial and Industrial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Number | Modification | 0 | 3
Financing Receivables, Modifications during Period, Balance | $ | $ 0 | $ 2,342
Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivables, Modifications during Period, Number | Modification | 3 | 1
Financing Receivables, Modifications during Period, Balance | $ | $ 24 | $ 11

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