Loans and Allowance - Summary of Troubled Debt Restructurings by Modification Type (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($) loan	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre- Modification Recorded Balance	$ 12,938	$ 2,640	$ 13,998	$ 4,159
Post - Modification Recorded Balance	$ 12,992	$ 2,652	$ 14,054	$ 4,208
Number of Loans | loan	2	34	14,000	45,000
Term Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance	$ 12,976	$ 2,506	$ 13,773	$ 3,725
Rate Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance	16	146	142	259
Combination
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance			139	224
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre- Modification Recorded Balance			348	654
Post - Modification Recorded Balance			$ 348	$ 654
Number of Loans | loan			2,000	3,000
Commercial and industrial loans | Term Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance			$ 348	$ 654
Commercial and industrial loans | Rate Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance			0	0
Commercial and industrial loans | Combination
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance			0	0
Agricultural land, production and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre- Modification Recorded Balance				458
Post - Modification Recorded Balance				$ 458
Number of Loans | loan				1,000
Agricultural land, production and other loans to farmers | Term Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance				$ 458
Agricultural land, production and other loans to farmers | Rate Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance				0
Agricultural land, production and other loans to farmers | Combination
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance				0
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre- Modification Recorded Balance	16		16
Post - Modification Recorded Balance	$ 16		$ 16
Number of Loans | loan	1		1,000
Construction | Term Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance	$ 0		$ 0
Construction | Rate Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance	16		16
Construction | Combination
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance			0
Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre- Modification Recorded Balance	12,922		12,922
Post - Modification Recorded Balance	$ 12,976		$ 12,976
Number of Loans | loan	1		1,000
Commercial real estate, non-owner occupied | Term Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance	$ 12,976		$ 12,976
Commercial real estate, non-owner occupied | Rate Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance	$ 0		0
Commercial real estate, non-owner occupied | Combination
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance			0
Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre- Modification Recorded Balance			21	107
Post - Modification Recorded Balance			$ 21	$ 107
Number of Loans | loan			1,000	1,000
Commercial real estate, owner occupied | Term Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance			$ 0	$ 107
Commercial real estate, owner occupied | Rate Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance			0	0
Commercial real estate, owner occupied | Combination
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance			21	0
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre- Modification Recorded Balance		2,314	691	2,614
Post - Modification Recorded Balance		$ 2,326	$ 693	$ 2,663
Number of Loans | loan		30	9,000	36,000
Residential | Term Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance		$ 2,275	$ 449	$ 2,276
Residential | Rate Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance		51	126	163
Residential | Combination
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance			$ 118	224
Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre- Modification Recorded Balance		307		307
Post - Modification Recorded Balance		$ 307		$ 307
Number of Loans | loan		2		2,000
Home Equity | Term Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance		$ 212		$ 211
Home Equity | Rate Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance		95		96
Home Equity | Combination
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance				0
Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre- Modification Recorded Balance		19		19
Post - Modification Recorded Balance		$ 19		$ 19
Number of Loans | loan		2		2,000
Individuals' loans for household and other personal expenditures | Term Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance		$ 19		$ 19
Individuals' loans for household and other personal expenditures | Rate Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance		$ 0		0
Individuals' loans for household and other personal expenditures | Combination
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post - Modification Recorded Balance				$ 0