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Loans and Allowance for Loan Losses - Impairment Methodology (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Allowance for loan losses: |  |  |  |
Individually evaluated for impairment | $ 5,144 | $ 5,113 |  |
Collectively evaluated for impairment | 13,217 | 13,000 |  |
Total | 18,361 | 18,113 | $ 15,693 | $ 12,477
Loans outstanding: |  |  |  |
Individually evaluated for impairment | 36,647 | 37,335 |  |
Collectively evaluated for impairment | 1,239,538 | 1,249,632 |  |
Total | 1,276,185 | 1,286,967 |  |
Commercial, financial, and agricultural |  |  |  |
Allowance for loan losses: |  |  |  |
Individually evaluated for impairment | 2,134 | 2,187 |  |
Collectively evaluated for impairment | 2,542 | 2,934 |  |
Total | 4,676 | 5,121 | 3,623 | 2,918
Loans outstanding: |  |  |  |
Individually evaluated for impairment | 7,408 | 7,552 |  |
Collectively evaluated for impairment | 244,535 | 265,366 |  |
Total | 251,943 | 272,918 |  |
Residential real estate | Construction |  |  |  |
Allowance for loan losses: |  |  |  |
Individually evaluated for impairment | 26 | 27 |  |
Collectively evaluated for impairment | 283 | 186 |  |
Total | 309 | 213 | 117 | 64
Loans outstanding: |  |  |  |
Individually evaluated for impairment | 189 | 192 |  |
Collectively evaluated for impairment | 33,773 | 29,500 |  |
Total | 33,962 | 29,692 |  |
Residential real estate | Mortgages |  |  |  |
Allowance for loan losses: |  |  |  |
Individually evaluated for impairment | 256 | 263 |  |
Collectively evaluated for impairment | 2,338 | 2,416 |  |
Total | 2,594 | 2,679 | 2,363 | 2,118
Loans outstanding: |  |  |  |
Individually evaluated for impairment | 3,134 | 3,626 |  |
Collectively evaluated for impairment | 255,125 | 258,713 |  |
Total | 258,259 | 262,339 |  |
Commercial real estate | Construction |  |  |  |
Allowance for loan losses: |  |  |  |
Individually evaluated for impairment | 28 | 28 |  |
Collectively evaluated for impairment | 504 | 447 |  |
Total | 532 | 475 | 622 | 369
Loans outstanding: |  |  |  |
Individually evaluated for impairment | 198 | 200 |  |
Collectively evaluated for impairment | 78,378 | 77,944 |  |
Total | 78,576 | 78,144 |  |
Commercial real estate | Mortgages |  |  |  |
Allowance for loan losses: |  |  |  |
Individually evaluated for impairment | 2,691 | 2,594 |  |
Collectively evaluated for impairment | 7,213 | 6,760 |  |
Total | 9,904 | 9,354 | 8,614 | 6,547
Loans outstanding: |  |  |  |
Individually evaluated for impairment | 25,647 | 25,657 |  |
Collectively evaluated for impairment | 602,531 | 591,476 |  |
Total | 628,178 | 617,133 |  |
Installment and other consumer |  |  |  |
Allowance for loan losses: |  |  |  |
Individually evaluated for impairment | 9 | 14 |  |
Collectively evaluated for impairment | 236 | 250 |  |
Total | 245 | 264 | 351 | 381
Loans outstanding: |  |  |  |
Individually evaluated for impairment | 71 | 108 |  |
Collectively evaluated for impairment | 25,196 | 26,633 |  |
Total | 25,267 | 26,741 |  |
Unallocated |  |  |  |
Allowance for loan losses: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 101 | 7 |  |
Total | 101 | 7 | $ 3 | $ 80
Loans outstanding: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 0 | 0 |  |
Total | $ 0 | $ 0 |  |

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