Loans and Allowance - Summary of Non-Accrual Loans by Loan Class (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 15,649	$ 15,949
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	1,759	1,255
Agricultural production financing and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0	183
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	1,094	977
Commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	6,995	7,007
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	4,332	5,062
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	1,409	1,421
Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 60	$ 44