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Loans and Allowance - Summary of Troubled Debt Restructurings by Modification (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification $ 3,785 $ 675
Term Modification    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 3,193 95
Rate Modification    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 252 87
Combination    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 340 493
Commercial and industrial loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 585  
Commercial and industrial loans | Term Modification    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 585  
Commercial and industrial loans | Rate Modification    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 0  
Commercial and industrial loans | Combination    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 0  
Construction    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 120  
Construction | Term Modification    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 0  
Construction | Rate Modification    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 0  
Construction | Combination    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 120  
Commercial real estate, owner occupied    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 103  
Commercial real estate, owner occupied | Term Modification    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 103  
Commercial real estate, owner occupied | Rate Modification    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 0  
Commercial real estate, owner occupied | Combination    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 0  
Residential    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 2,632 614
Residential | Term Modification    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 2,253 95
Residential | Rate Modification    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 159 87
Residential | Combination    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 220 432
Home equity    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 329 61
Home equity | Term Modification    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 236 0
Home equity | Rate Modification    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 93 0
Home equity | Combination    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 0 $ 61
Individuals' loans for household and other personal expenditures    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 16  
Individuals' loans for household and other personal expenditures | Term Modification    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 16  
Individuals' loans for household and other personal expenditures | Rate Modification    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification 0  
Individuals' loans for household and other personal expenditures | Combination    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total Modification $ 0