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Business Combinations (Allocation of Purchase Price) (Details) - USD ($) |  |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 01, 2021 | May 03, 2021 | Mar. 01, 2020 | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Consideration transferred: |  |  |  |  |  |
Goodwill |  |  |  | $ 89,984,000 | $ 74,135,000 | $ 65,614,000
Sevier County Bancshares Inc [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash and cash equivalents | $ 84,313,000 |  |  | 84,313,000 |  |
Investment securities available-for-sale | 64,219,000 |  |  | 63,605,000 |  |
Restricted investments | 533,000 |  |  | 533,000 |  |
Loans | 304,620,000 |  |  | 300,069,000 |  |
Allowance for loan losses | (3,644,000) |  |  |  |  |
Premises and equipment | 15,579,000 |  |  | 15,284,000 |  |
Core deposit intangible |  |  |  | 1,550,000 |  |
Bank owned life insurance | 7,116,000 |  |  | 7,116,000 |  |
Deferred tax asset, net | 10,340,000 |  |  | 6,333,000 |  |
Interest Receivable | 884,000 |  |  | 884,000 |  |
Other assets | 920,000 |  |  | 648,000 |  |
Total assets acquired | 484,880,000 |  |  | 480,335,000 |  |
Liabilities: |  |  |  |  |  |
Deposits | 435,036,000 |  |  | 435,036,000 |  |
Time deposit premium |  |  |  | 888,000 |  |
Subordinated debt | 2,500,000 |  |  | 2,500,000 |  |
Payables and other liabilities | 5,563,000 |  |  | 5,678,000 |  |
Total liabilities assumed | 443,099,000 |  |  | 444,102,000 |  |
Total fair value of net assets acquired | 41,781,000 |  |  | 36,233,000 |  |
Cash consideration paid | $ 9,600,000 |  |  | 9,568,000 |  |
Common stock issued |  |  |  | 42,254,000 |  |
Number of shares issued (in shares) | 1,691,535 |  |  |  |  |
Business Combination, Consideration Transferred, Total |  |  |  | 51,822,000 |  |
Assets: |  |  |  |  |  |
Investment securities available-for-sale | $ (614,000) |  |  |  |  |
Loans | (4,551,000) |  |  |  |  |
Allowance for loan losses | 3,644,000 |  |  |  |  |
Premises and equipment, net | (295,000) |  |  |  |  |
Deferred tax asset, net | (4,007,000) |  |  |  |  |
Core deposit intangible | 1,550,000 |  |  |  |  |
Other assets | (272,000) |  |  |  |  |
Total assets acquired | (4,545,000) |  |  |  |  |
Liabilities: |  |  |  |  |  |
Time deposit premium | 888,000 |  |  |  |  |
Payables and other liabilities | 115,000 |  |  |  |  |
Total liabilities assumed | 1,003,000 |  |  |  |  |
Consideration transferred: |  |  |  |  |  |
Aggregate fair value adjustments | (5,548,000) |  |  |  |  |
Goodwill | $ 15,600,000 |  |  | 15,589,000 |  |
Fountain [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash and cash equivalents |  | $ 413,000 |  | 413,000 |  |
Leases |  | 54,945,000 |  | 54,225,000 |  |
Allowance for loan losses |  | (1,796,000) |  |  |  |
Intangibles |  |  |  | 2,658,000 |  |
Other repossessed assets |  | 319,000 |  | 319,000 |  |
Other assets |  | 233,000 |  | 233,000 |  |
Total assets acquired |  | 54,114,000 |  | 57,848,000 |  |
Liabilities: |  |  |  |  |  |
Payables and other liabilities |  | 683,000 |  | 454,000 |  |
Total liabilities assumed |  | 683,000 |  | 454,000 |  |
Total fair value of net assets acquired |  | 53,431,000 |  | 57,394,000 |  |
Cash consideration paid |  | 14,000,000.0 |  | 59,794,000 |  |
Business Combination, Consideration Transferred, Total |  |  |  | 59,794,000 |  |
Assets: |  |  |  |  |  |
Leases |  | (720,000) |  |  |  |
Allowance for loan losses |  | 1,796,000 |  |  |  |
Intangibles |  | 2,658,000 |  |  |  |
Total assets acquired |  | 3,734,000 |  |  |  |
Liabilities: |  |  |  |  |  |
Payables and other liabilities |  | (229,000) |  |  |  |
Total liabilities assumed |  | (229,000) |  |  |  |
Consideration transferred: |  |  |  |  |  |
Aggregate fair value adjustments |  | 3,963,000 |  |  |  |
Goodwill |  | $ 2,400,000 |  | 2,400,000 |  |
Progressive Financial Group Inc. [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash and cash equivalents |  |  | $ 55,971,000 | 55,971,000 |  |
Investment securities available-for-sale |  |  | 27,054,000 | 27,257,000 |  |
Restricted investments |  |  | 692,000 | 692,000 |  |
Loans |  |  | 191,672,000 | 187,981,000 |  |
Allowance for loan losses |  |  | (2,832,000) |  |  |
Premises and equipment |  |  | 15,681,000 | 12,762,000 |  |
Bank owned life insurance |  |  | 5,560,000 | 5,560,000 |  |
Deferred tax asset, net |  |  |  | 1,006,000 |  |
Intangibles |  |  |  | 2,497,000 |  |
Other real estate owned |  |  | 3,695,000 | 1,733,000 |  |
Interest Receivable |  |  | 1,061,000 | 781,000 |  |
Prepaids |  |  | 375,000 | 201,000 |  |
Goodwill |  |  | 231,000 |  |  |
Other assets |  |  | 1,881,000 | 1,881,000 |  |
Total assets acquired |  |  | 301,041,000 | 298,322,000 |  |
Liabilities: |  |  |  |  |  |
Deposits |  |  | 271,276,000 | 271,276,000 |  |
Time deposit premium |  |  |  | 729,000 |  |
Payables and other liabilities |  |  | 776,000 | 776,000 |  |
Total liabilities assumed |  |  | 272,052,000 | 272,781,000 |  |
Total fair value of net assets acquired |  |  | 28,989,000 | 25,541,000 |  |
Cash consideration paid |  |  | 9,800,000 | 9,838,000 |  |
Common stock issued |  |  | $ 1,292,578 | 24,547,000 |  |
Number of shares issued (in shares) |  |  | 1,292,578 |  |  |
Business Combination, Consideration Transferred, Total |  |  |  | 34,385,000 |  |
Assets: |  |  |  |  |  |
Investment securities available-for-sale |  |  | $ 203,000 |  |  |
Loans |  |  | (3,691,000) |  |  |
Allowance for loan losses |  |  | 2,832,000 |  |  |
Premises and equipment, net |  |  | (2,919,000) |  |  |
Deferred tax asset, net |  |  | 813,000 | 193,000 |  |
Intangibles |  |  | 1,370,000 | 1,127,000 |  |
Other real estate owned |  |  | (100,000) | (1,862,000) |  |
Interest Receivable |  |  | (280,000) |  |  |
Prepaids |  |  | (174,000) |  |  |
Goodwill |  |  | (231,000) |  |  |
Total assets acquired |  |  | (2,177,000) | (542,000) |  |
Liabilities: |  |  |  |  |  |
Time deposit premium |  |  | 729,000 |  |  |
Total liabilities assumed |  |  | 729,000 |  |  |
Consideration transferred: |  |  |  |  |  |
Aggregate fair value adjustments |  |  | (2,906,000) | (542,000) |  |
Goodwill |  |  | $ 8,800,000 | $ 8,844,000 |  |

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