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Goodwill and Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Finite-lived Intangible Assets [Roll Forward]    
Balance, beginning of period $ 17,047 $ 14,550
Balance, gross core deposit intangible 21,255 17,047
Finite Lived Intangible Assets Accumulated Amortization [Abstract]    
Gross Carrying Amount 21,255 17,047
Less: accumulated amortization (6,309) (4,711)
Total 14,946 12,336
Progressive Financial Group Inc. [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Acquisition of business   2,497
Fountain Leasing Limited Liability Company [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Acquisition of business 2,658  
Sevier County Bancshares Inc [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Acquisition of business 1,550  
Core Deposits [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Balance, beginning of period 15,920 14,550
Balance, gross core deposit intangible 17,470 15,920
Finite Lived Intangible Assets Accumulated Amortization [Abstract]    
Gross Carrying Amount 17,470 15,920
Less: accumulated amortization (5,748) (4,540)
Total 11,722 11,380
Core Deposits [Member] | Progressive Financial Group Inc. [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Acquisition of business   1,370
Core Deposits [Member] | Sevier County Bancshares Inc [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Acquisition of business 1,550  
Customer Relationships [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Balance, beginning of period 1,064  
Balance, gross core deposit intangible 3,722 1,064
Finite Lived Intangible Assets Accumulated Amortization [Abstract]    
Gross Carrying Amount 3,722 1,064
Less: accumulated amortization (541) (161)
Total 3,181 903
Customer Relationships [Member] | Progressive Financial Group Inc. [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Acquisition of business   1,064
Customer Relationships [Member] | Fountain Leasing Limited Liability Company [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Acquisition of business 2,658  
Trade Names [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Balance, beginning of period 63  
Balance, gross core deposit intangible 63 63
Finite Lived Intangible Assets Accumulated Amortization [Abstract]    
Gross Carrying Amount 63 63
Less: accumulated amortization (20) (10)
Total $ 43 53
Trade Names [Member] | Progressive Financial Group Inc. [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Acquisition of business   $ 63