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Loans and Allowance for Loan Losses - Impairment Methodology (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Allowance for loan losses: |  |  |  |
Individually evaluated for impairment | $ 5,113 | $ 615 |  |
Collectively evaluated for impairment | 13,000 | 11,862 |  |
Total | 18,113 | 12,477 | $ 11,652 | $ 10,852
Loans outstanding: |  |  |  |
Individually evaluated for impairment | 37,335 | 7,395 |  |
Collectively evaluated for impairment | 1,249,632 | 1,161,402 |  |
Total | 1,286,967 | 1,168,797 |  |
Commercial, financial, and agricultural |  |  |  |
Allowance for loan losses: |  |  |  |
Individually evaluated for impairment | 2,187 | 311 |  |
Collectively evaluated for impairment | 2,934 | 2,607 |  |
Total | 5,121 | 2,918 | 3,237 | 3,325
Loans outstanding: |  |  |  |
Individually evaluated for impairment | 7,552 | 1,514 |  |
Collectively evaluated for impairment | 265,366 | 197,508 |  |
Total | 272,918 | 199,022 |  |
Residential real estate | Construction |  |  |  |
Allowance for loan losses: |  |  |  |
Individually evaluated for impairment | 27 |  |  |
Collectively evaluated for impairment | 186 | 64 |  |
Total | 213 | 64 | 140 | 170
Loans outstanding: |  |  |  |
Individually evaluated for impairment | 192 |  |  |
Collectively evaluated for impairment | 29,500 | 23,035 |  |
Total | 29,692 | 23,035 |  |
Residential real estate | Mortgages |  |  |  |
Allowance for loan losses: |  |  |  |
Individually evaluated for impairment | 263 | 264 |  |
Collectively evaluated for impairment | 2,416 | 1,854 |  |
Total | 2,679 | 2,118 | 2,071 | 1,689
Loans outstanding: |  |  |  |
Individually evaluated for impairment | 3,626 | 3,856 |  |
Collectively evaluated for impairment | 258,713 | 248,787 |  |
Total | 262,339 | 252,643 |  |
Commercial real estate | Construction |  |  |  |
Allowance for loan losses: |  |  |  |
Individually evaluated for impairment | 28 |  |  |
Collectively evaluated for impairment | 447 | 369 |  |
Total | 475 | 369 | 757 | 807
Loans outstanding: |  |  |  |
Individually evaluated for impairment | 200 | 137 |  |
Collectively evaluated for impairment | 77,944 | 84,861 |  |
Total | 78,144 | 84,998 |  |
Commercial real estate | Mortgages |  |  |  |
Allowance for loan losses: |  |  |  |
Individually evaluated for impairment | 2,594 | 23 |  |
Collectively evaluated for impairment | 6,760 | 6,524 |  |
Total | 9,354 | 6,547 | 4,914 | 4,437
Loans outstanding: |  |  |  |
Individually evaluated for impairment | 25,657 | 1,711 |  |
Collectively evaluated for impairment | 591,476 | 574,924 |  |
Total | 617,133 | 576,635 |  |
Installment and other consumer |  |  |  |
Allowance for loan losses: |  |  |  |
Individually evaluated for impairment | 14 | 17 |  |
Collectively evaluated for impairment | 250 | 364 |  |
Total | 264 | 381 | 334 | 345
Loans outstanding: |  |  |  |
Individually evaluated for impairment | 108 | 177 |  |
Collectively evaluated for impairment | 26,633 | 32,287 |  |
Total | 26,741 | 32,464 |  |
Unallocated |  |  |  |
Allowance for loan losses: |  |  |  |
Collectively evaluated for impairment | 7 | 80 |  |
Total | $ 7 | $ 80 | $ 199 | $ 79

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