Loans and Allowance for Loan Losses - Loans Modified as Troubled Debt Restructurings During Period (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) Modification	Dec. 31, 2019 USD ($) Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	8	10
Financing Receivables, Modifications during Period, Balance | $	$ 2,723	$ 1,708
Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	1	4
Financing Receivables, Modifications during Period, Balance | $	$ 296	$ 1,506
Residential Properties | Real Estate Loan | 1-4 Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	0	1
Financing Receivables, Modifications during Period, Balance | $	$ 0	$ 44
Commercial Real Estate | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	1	3
Financing Receivables, Modifications during Period, Balance | $	$ 296	$ 1,462
Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	2	1
Financing Receivables, Modifications during Period, Balance | $	$ 88	$ 59
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	4	4
Financing Receivables, Modifications during Period, Balance | $	$ 2,328	$ 131
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 | $	$ 11	$ 12