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Loans and Allowance for Loan Losses - Additional information about Impaired Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Impaired loans |  |
Recorded Investment, With no related allowance recorded | $ 2,093 | $ 2,433
Unpaid Principal Balance, With no related allowance recorded | 2,451 | 2,528
Recorded Investment, With an allowance recorded | 6,385 | 7,923
Unpaid Principal Balance, With an allowance recorded | 7,067 | 8,370
Specific Reserves, With an allowance recorded | 1,194 | 1,333
Total impaired loans, Recorded Investment | 8,478 | 10,356
Total impaired loans, Unpaid Principal Balance | 9,518 | 10,898
Commercial, financial, and agricultural |  |
Impaired loans |  |
Recorded Investment, With no related allowance recorded | 1,264 | 1,393
Unpaid Principal Balance, With no related allowance recorded | 1,550 | 1,445
Recorded Investment, With an allowance recorded | 1,164 | 1,614
Unpaid Principal Balance, With an allowance recorded | 1,236 | 1,834
Specific Reserves, With an allowance recorded | 551 | 500
Residential real estate |  |
Impaired loans |  |
Recorded Investment, With no related allowance recorded | 561 | 674
Unpaid Principal Balance, With no related allowance recorded | 602 | 688
Recorded Investment, With an allowance recorded | 4,232 | 4,398
Unpaid Principal Balance, With an allowance recorded | 4,458 | 4,500
Specific Reserves, With an allowance recorded | 579 | 521
Commercial real estate |  |
Impaired loans |  |
Recorded Investment, With no related allowance recorded | 115 | 366
Unpaid Principal Balance, With no related allowance recorded | 119 | 395
Recorded Investment, With an allowance recorded | 735 | 1,638
Unpaid Principal Balance, With an allowance recorded | 1,093 | 1,743
Specific Reserves, With an allowance recorded | 37 | 243
Commercial real estate | Construction |  |
Impaired loans |  |
Recorded Investment, With no related allowance recorded | 153 |
Unpaid Principal Balance, With no related allowance recorded | 180 |
Recorded Investment, With an allowance recorded |  | 97
Unpaid Principal Balance, With an allowance recorded |  | 97
Specific Reserves, With an allowance recorded |  | 48
Installment and other consumer |  |
Impaired loans |  |
Recorded Investment, With an allowance recorded | 254 | 176
Unpaid Principal Balance, With an allowance recorded | 280 | 196
Specific Reserves, With an allowance recorded | $ 27 | $ 21

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