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Loans and Allowance for Loan Losses - Impairment Methodology (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Allowance for loan losses: |  |  |  |  |  |
Individually evaluated for impairment | $ 708 |  | $ 1,194 |  |  |
Collectively evaluated for impairment | 11,470 |  | 10,458 |  |  |
Total | 12,178 | $ 11,883 | 11,652 | $ 11,358 | $ 11,212 | $ 10,852
Loans outstanding: |  |  |  |  |  |
Individually evaluated for impairment | 7,255 |  | 8,478 |  |  |
Collectively evaluated for impairment | 1,144,263 |  | 1,138,149 |  |  |
Total | 1,151,518 |  | 1,146,627 |  |  |
Commercial, financial, and agricultural |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Individually evaluated for impairment | 361 |  | 551 |  |  |
Collectively evaluated for impairment | 2,528 |  | 2,686 |  |  |
Total | 2,889 | 2,783 | 3,237 | 3,486 | 3,943 | 3,325
Loans outstanding: |  |  |  |  |  |
Individually evaluated for impairment | 1,578 |  | 2,428 |  |  |
Collectively evaluated for impairment | 191,689 |  | 205,292 |  |  |
Total | 193,267 |  | 207,720 |  |  |
Residential real estate | Construction |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 84 |  | 140 |  |  |
Total | 84 | 69 | 140 | 240 | 201 | 170
Loans outstanding: |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 23,782 |  | 28,610 |  |  |
Total | 23,782 |  | 28,610 |  |  |
Residential real estate | Mortgages |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Individually evaluated for impairment | 296 |  | 579 |  |  |
Collectively evaluated for impairment | 1,650 |  | 1,492 |  |  |
Total | 1,946 | 1,772 | 2,071 | 2,341 | 2,109 | 1,689
Loans outstanding: |  |  |  |  |  |
Individually evaluated for impairment | 3,902 |  | 4,793 |  |  |
Collectively evaluated for impairment | 244,533 |  | 236,724 |  |  |
Total | 248,435 |  | 241,517 |  |  |
Commercial real estate | Construction |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 801 |  | 757 |  |  |
Total | 801 | 704 | 757 | 746 | 905 | 807
Loans outstanding: |  |  |  |  |  |
Individually evaluated for impairment | 145 |  | 153 |  |  |
Collectively evaluated for impairment | 124,244 |  | 106,631 |  |  |
Total | 124,389 |  | 106,784 |  |  |
Commercial real estate | Mortgages |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Individually evaluated for impairment | 34 |  | 37 |  |  |
Collectively evaluated for impairment | 6,061 |  | 4,877 |  |  |
Total | 6,095 | 6,109 | 4,914 | 4,071 | 3,630 | 4,437
Loans outstanding: |  |  |  |  |  |
Individually evaluated for impairment | 1,469 |  | 850 |  |  |
Collectively evaluated for impairment | 528,541 |  | 528,686 |  |  |
Total | 530,010 |  | 529,536 |  |  |
Installment and other consumer |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Individually evaluated for impairment | 17 |  | 27 |  |  |
Collectively evaluated for impairment | 311 |  | 307 |  |  |
Total | 328 | 307 | 334 | 398 | 413 | 345
Loans outstanding: |  |  |  |  |  |
Individually evaluated for impairment | 161 |  | 254 |  |  |
Collectively evaluated for impairment | 31,474 |  | 32,206 |  |  |
Total | 31,635 |  | 32,460 |  |  |
Unallocated |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 35 |  | 199 |  |  |
Total | 35 | $ 139 | 199 | $ 76 | $ 11 | $ 79
Loans outstanding: |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Total | $ 0 |  | $ 0 |  |  |

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