Loans and Allowance for Credit Losses - Recorded Balance of Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings Balance	$ 8,210	$ 9,502
Financing Receivable Modifications Performing Recorded Investment	3,560	4,373	$ 2,600
Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings Balance	5,537	6,773
Financing Receivable Modifications Performing Recorded Investment	3,484	4,313
Residential Properties | Real Estate Loan | 1-4 Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings Balance	1,634	1,603
Financing Receivable Modifications Performing Recorded Investment	904	1,268
Commercial | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings Balance	3,903	5,170
Financing Receivable Modifications Performing Recorded Investment	2,580	3,045
Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings Balance	228	228
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings Balance	2,351	2,389
Financing Receivable Modifications Performing Recorded Investment	52	58
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings Balance	94	112
Financing Receivable Modifications Performing Recorded Investment	$ 24	$ 2