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Loans and Allowance - Summary of Troubled Debt Restructurings (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
loan
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Pre-Modification Recorded Balance $ 4,413 $ 692
Post-Modification Recorded Balance $ 4,473 $ 690
Number of Loans | loan 49 13
Commercial and industrial loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Pre-Modification Recorded Balance $ 654  
Post-Modification Recorded Balance $ 654  
Number of Loans | loan 3  
Agricultural land, production and other loans to farmers    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Pre-Modification Recorded Balance $ 458  
Post-Modification Recorded Balance $ 458  
Number of Loans | loan 1  
Construction    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Pre-Modification Recorded Balance $ 113  
Post-Modification Recorded Balance $ 123  
Number of Loans | loan 1  
Commercial real estate, owner occupied    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Pre-Modification Recorded Balance $ 107  
Post-Modification Recorded Balance $ 107  
Number of Loans | loan 1  
Residential    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Pre-Modification Recorded Balance $ 2,730 $ 636
Post-Modification Recorded Balance $ 2,780 $ 629
Number of Loans | loan 38 11
Home equity    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Pre-Modification Recorded Balance $ 332 $ 56
Post-Modification Recorded Balance $ 332 $ 61
Number of Loans | loan 3 2
Individuals' loans for household and other personal expenditures    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Pre-Modification Recorded Balance $ 19  
Post-Modification Recorded Balance $ 19  
Number of Loans | loan 2