Loans and Allowance for Loan Losses - Recorded Balance of Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings Balance	$ 6,584	$ 5,803
Financing Receivable Modifications Performing Recorded Investment	2,634	2,701	$ 2,800
Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings Balance	3,673	3,651
Financing Receivable Modifications Performing Recorded Investment	2,465	2,528
Residential Properties | Real Estate Loan | 1-4 Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings Balance	1,817	1,905
Financing Receivable Modifications Performing Recorded Investment	1,337	1,382
Commercial | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings Balance	1,856	1,746
Financing Receivable Modifications Performing Recorded Investment	1,128	1,146
Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings Balance	316	669
Financing Receivable Modifications Performing Recorded Investment	88	40
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings Balance	2,466	1,349
Financing Receivable Modifications Performing Recorded Investment	78	128
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings Balance	129	134
Financing Receivable Modifications Performing Recorded Investment	$ 3	$ 5