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Business Combinations (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 13 Months Ended 17 Months Ended
Sep. 01, 2022
Sep. 01, 2021
May 03, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2022
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]                      
Common stock, par value (in dollars per share)   $ 1.00   $ 1   $ 1   $ 1 $ 1 $ 1  
Goodwill       $ 96,145   $ 96,145   $ 96,145 $ 96,145 $ 91,565 $ 74,135
Merger-related costs       87 $ 464 $ 607 $ 939        
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)   1,692,168       1,692,168          
Purchase price/Cash   $ 9,600           9,568      
Assets acquired   484,880   477,500   $ 477,500   477,500 477,500    
Liabilities assumed   443,099   442,848   442,848   442,848 442,848    
Goodwill   17,200   17,171   17,171   17,171 17,171    
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]                      
Purchase price/Cash     $ 14,000           59,794    
Repayment of indebtedness     45,800                
Future cash payments of performance-based earnout     6,000                
Assets acquired     54,114 57,848   57,848   57,848 57,848    
Liabilities assumed     683 454   454   454 454    
Goodwill     2,400 2,400   2,400   2,400 2,400    
Fountain [Member] | Customer Relationships [Member]                      
Business Acquisition [Line Items]                      
Intangible assets acquired     $ 2,700                
Useful life     8 years                
Sunbelt Group LLC [Member]                      
Business Acquisition [Line Items]                      
Purchase price/Cash           6,500          
Pro forma, revenue of acquiree since acquisition date, actual       168   168          
Pro forma information, earnings (loss) since acquisition date, actual       1   1          
Pro forma revenue       43,008 37,335 120,681 102,613        
Pro forma net income (loss)       11,548 $ 9,750 29,992 $ 28,612        
Assets acquired $ 349     2,284   2,284   2,284 2,284    
Liabilities assumed 364     364   364   364 364    
Purchase consideration paid in cash 5,200                    
Goodwill 4,600     4,580   4,580   $ 4,580 $ 4,580    
Merger-related costs       $ 20   $ 20          
Sunbelt Group LLC [Member] | Customer Relationships [Member]                      
Business Acquisition [Line Items]                      
Intangible assets acquired $ 1,900                    
Useful life 14 years