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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

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