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Business Combinations (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 01, 2021
May 03, 2021
Mar. 01, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]                  
Common stock, par value (in dollars per share) $ 1.00     $ 1   $ 1   $ 1  
Goodwill       $ 89,984   $ 89,984   $ 74,135 $ 65,614
Merger-related costs       464 $ 290 939 $ 3,863    
Sevier County Bancshares Inc [Member]                  
Business Acquisition [Line Items]                  
Common stock, par value (in dollars per share) 0                
Sevier County Bancshares Inc [Member]                  
Business Acquisition [Line Items]                  
Cash to be paid upon conversion (in dollars per share) $ 10.17                
Common shares to be converted (in shares) 0.4116                
Number of shares issued (in shares) 1,691,535                
Cash consideration paid $ 9,600         9,568      
Pro forma, revenue of acquiree since acquisition date, actual       1,090   1,090      
Pro forma information, earnings (loss) since acquisition date, actual       343   343      
Pro forma revenue       39,207 32,965 110,745 93,213    
Pro forma net income (loss)       10,516 6,624 30,984 16,473    
Assets acquired 484,880     480,335   480,335      
Liabilities assumed 443,099     444,102   444,102      
Goodwill 15,600     15,589   15,589      
Merger-related costs       445   683      
Sevier County Bancshares Inc [Member] | Core Deposits [Member]                  
Business Acquisition [Line Items]                  
Intangible assets acquired $ 1,600                
Useful life 10 years                
Sevier County Bancshares Inc [Member] | Sevier County Bancshares Inc [Member]                  
Business Acquisition [Line Items]                  
Threshold number of shares to be held by a shareholder to receive the per share stock consideration 20,000                
Fountain [Member]                  
Business Acquisition [Line Items]                  
Cash consideration paid   $ 14,000       59,794      
Repayment of indebtedness   45,800              
Future cash payments of performance-based earnout   6,000              
Pro forma, revenue of acquiree since acquisition date, actual       1,696   2,834      
Pro forma information, earnings (loss) since acquisition date, actual       357   702      
Pro forma revenue       36,690 31,566 102,470 89,016    
Pro forma net income (loss)       9,614 $ 6,744 28,101 $ 16,274    
Assets acquired   54,114   57,848   57,848      
Liabilities assumed   683   454   454      
Goodwill   2,400   2,400   2,400      
Merger-related costs       18   159      
Fountain [Member] | Customer Relationships [Member]                  
Business Acquisition [Line Items]                  
Intangible assets acquired   $ 2,700              
Useful life   8 years              
Progressive Financial Group Inc. [Member]                  
Business Acquisition [Line Items]                  
Cash to be paid upon conversion (in dollars per share)     $ 474.82            
Common shares to be converted (in shares)     62.3808            
Number of shares issued (in shares)     1,292,578            
Cash consideration paid     $ 9,800     9,838      
Assets acquired     301,041 298,322   298,322      
Liabilities assumed     272,052 272,781   272,781      
Goodwill     8,800 $ 8,844   $ 8,844      
Progressive Financial Group Inc. [Member] | Core Deposits [Member]                  
Business Acquisition [Line Items]                  
Intangible assets acquired     $ 1,400            
Useful life     10 years            
Progressive Financial Group Inc. [Member] | Customer Relationships [Member]                  
Business Acquisition [Line Items]                  
Intangible assets acquired     $ 1,100            
Useful life     10 years            
Progressive Financial Group Inc. [Member] | Trade Names [Member]                  
Business Acquisition [Line Items]                  
Intangible assets acquired     $ 63            
Useful life     5 years