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Loans and Allowance for Credit Losses - Loans Modified as Troubled Debt Restructurings During Period (Details) $ in Thousands	12 Months Ended
	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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