Loans and Allowance - Summary of Non-Accrual Loans by Loan Class (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 61,471	$ 15,949
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	2,329	1,255
Agricultural land, production and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	1,012	1,180
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	123	977
Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	46,316	3,351
Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	3,040	2,659
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	6,517	5,062
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	2,095	1,421
Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 39	$ 44