Loans and Allowance - Summary of Troubled Debt Restructurings by Modification Type (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($) loan	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre- Modification Recorded Balance	$ 87	$ 1,519	$ 1,060	$ 1,519
Post - Modification Recorded Balance	$ 87	$ 1,556	$ 1,062	$ 1,556
Number of Loans | loan	3	11	12,000	11,000
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre- Modification Recorded Balance		$ 654	$ 348	$ 654
Post - Modification Recorded Balance		$ 654	$ 348	$ 654
Number of Loans | loan		3	2,000	3,000
Agricultural land, production and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre- Modification Recorded Balance		$ 458		$ 458
Post - Modification Recorded Balance		$ 458		$ 458
Number of Loans | loan		1		1,000
Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre- Modification Recorded Balance	$ 21	$ 107	$ 21	$ 107
Post - Modification Recorded Balance	$ 21	$ 107	$ 21	$ 107
Number of Loans | loan	1	1	1,000	1,000
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre- Modification Recorded Balance	$ 66	$ 300	$ 691	$ 300
Post - Modification Recorded Balance	$ 66	$ 337	$ 693	$ 337
Number of Loans | loan	2	6	9,000	6,000
Term Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance	$ 66	$ 1,219	$ 797	$ 1,219
Term Modification | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance		654	348	654
Term Modification | Agricultural land, production and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance		458		458
Term Modification | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance	0	107	0	107
Term Modification | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance	66	0	449	0
Rate Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance		112	126	112
Rate Modification | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance		0	0	0
Rate Modification | Agricultural land, production and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance		0		0
Rate Modification | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance		0	0	0
Rate Modification | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance		112	126	112
Combination
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance	21	225	139	225
Combination | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance		0	0	0
Combination | Agricultural land, production and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance		0		0
Combination | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance	21	0	21	0
Combination | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance	$ 0	$ 225	$ 118	$ 225