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Loans and Allowance for Credit Losses - Loans Modified as Troubled Debt Restructurings During Period (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) Modification	Sep. 30, 2020 USD ($) Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	17	8
Financing Receivables, Modifications during Period, Balance | $	$ 2,267	$ 2,723
Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	5	1
Financing Receivables, Modifications during Period, Balance | $	$ 1,746	$ 296
Real Estate Loan | 1-4 Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	2	0
Financing Receivables, Modifications during Period, Balance | $	$ 323	$ 0
Construction and Land Development | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	1	0
Financing Receivables, Modifications during Period, Balance | $	$ 492	$ 0
Agricultural | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	1	0
Financing Receivables, Modifications during Period, Balance | $	$ 250	$ 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 | $	$ 681	$ 296
Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	1	2
Financing Receivables, Modifications during Period, Balance | $	$ 156	$ 88
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	6	4
Financing Receivables, Modifications during Period, Balance | $	$ 287	$ 2,328
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	4	1
Financing Receivables, Modifications during Period, Balance | $	$ 54	$ 11
All Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	1	0
Financing Receivables, Modifications during Period, Balance | $	$ 24	$ 0

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