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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, 2022
Dec. 31, 2021
Finite-lived Intangible Assets [Roll Forward]    
Balance, beginning of period $ 21,255 $ 17,047
Balance, end of period 23,203 21,255
Less: accumulated amortization (8,888) (6,968)
Total 14,315 14,287
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
Sunbelt Group LLC [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Acquisition of business 1,948  
Core Deposits [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Balance, beginning of period 17,470 15,920
Balance, end of period 17,470 17,470
Less: accumulated amortization (7,575) (6,212)
Total 9,895 11,258
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 3,722 1,064
Balance, end of period 5,670 3,722
Less: accumulated amortization (1,280) (733)
Total 4,390 2,989
Customer Relationships [Member] | Fountain Leasing Limited Liability Company [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Acquisition of business   2,658
Customer Relationships [Member] | Sunbelt Group LLC [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Acquisition of business 1,948  
Trade Names [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Balance, beginning of period 63 63
Balance, end of period 63 63
Less: accumulated amortization (33) (23)
Total $ 30 $ 40