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Loans and Allowance - Composition of Impaired Loans by Loan Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Unpaid Principal Balance |  |  |  |  |
Impaired loans with no related allowance | $ 20,384 |  | $ 20,384 |  | $ 14,555
Impaired loans with related allowance | 5,842 |  | 5,842 |  | 10,501
Total Impaired Loans | 26,226 |  | 26,226 |  | 25,056
Recorded Investment |  |  |  |  |
Impaired loans with no related allowance | 16,471 |  | 16,471 |  | 11,594
Impaired loans with related allowance | 5,502 |  | 5,502 |  | 10,431
Total Impaired Loans | 21,973 |  | 21,973 |  | 22,025
Related Allowance | 2,296 |  | 2,296 |  | 1,872
Average Recorded Investment |  |  |  |  |
Impaired loans with no related allowance | 17,433 | $ 12,758 | 18,112 | $ 13,128 |
Impaired loans with related allowance | 5,600 | 2,124 | 5,634 | 2,137 |
Total Impaired Loans | 23,033 | 14,882 | 23,746 | 15,265 |
Interest Income Recognized |  |  |  |  |
Impaired loans with no related allowance | 40 | 41 | 80 | 89 |
Impaired loans with related allowance | 19 | 14 | 38 | 29 |
Total Impaired Loans | 59 | 55 | 118 | 118 |
Commercial and industrial loans |  |  |  |  |
Unpaid Principal Balance |  |  |  |  |
Impaired loans with no related allowance | 1,048 |  | 1,048 |  | 828
Impaired loans with related allowance | 1,185 |  | 1,185 |  |
Recorded Investment |  |  |  |  |
Impaired loans with no related allowance | 1,012 |  | 1,012 |  | 806
Impaired loans with related allowance | 940 |  | 940 |  |
Related Allowance | 455 |  | 455 |  |
Average Recorded Investment |  |  |  |  |
Impaired loans with no related allowance | 1,013 | 1,004 | 1,021 | 1,006 |
Impaired loans with related allowance | 940 | 108 | 940 | 108 |
Interest Income Recognized |  |  |  |  |
Impaired loans with no related allowance | 0 | 0 | 0 | 0 |
Impaired loans with related allowance | 0 |  | 0 | 0 |
Agricultural production financing and other loans to farmers |  |  |  |  |
Unpaid Principal Balance |  |  |  |  |
Impaired loans with no related allowance | 679 |  | 679 |  | 679
Impaired loans with related allowance | 2,167 |  | 2,167 |  |
Recorded Investment |  |  |  |  |
Impaired loans with no related allowance | 668 |  | 668 |  | 679
Impaired loans with related allowance | 2,117 |  | 2,117 |  |
Related Allowance | 1,394 |  | 1,394 |  |
Average Recorded Investment |  |  |  |  |
Impaired loans with no related allowance | 668 | 640 | 672 | 640 |
Impaired loans with related allowance | 2,117 |  | 2,134 |  |
Interest Income Recognized |  |  |  |  |
Impaired loans with no related allowance | 0 | 0 | 0 | 0 |
Impaired loans with related allowance | 0 |  | 0 |  |
Construction |  |  |  |  |
Unpaid Principal Balance |  |  |  |  |
Impaired loans with no related allowance | 7,978 |  | 7,978 |  | 1,352
Impaired loans with related allowance |  |  |  |  | 7,978
Recorded Investment |  |  |  |  |
Impaired loans with no related allowance | 6,909 |  | 6,909 |  | 614
Impaired loans with related allowance |  |  |  |  | 7,977
Related Allowance |  |  |  |  | 1,429
Average Recorded Investment |  |  |  |  |
Impaired loans with no related allowance | 7,314 | 1,106 | 7,792 | 1,167 |
Interest Income Recognized |  |  |  |  |
Impaired loans with no related allowance | 0 | 0 | 0 | 0 |
Commercial and farmland |  |  |  |  |
Unpaid Principal Balance |  |  |  |  |
Impaired loans with no related allowance | 10,160 |  | 10,160 |  | 11,176
Impaired loans with related allowance | 134 |  | 134 |  | 171
Recorded Investment |  |  |  |  |
Impaired loans with no related allowance | 7,381 |  | 7,381 |  | 8,994
Impaired loans with related allowance | 129 |  | 129 |  | 171
Related Allowance | 14 |  | 14 |  | 6
Average Recorded Investment |  |  |  |  |
Impaired loans with no related allowance | 7,998 | 9,935 | 8,187 | 10,241 |
Impaired loans with related allowance | 157 |  | 164 |  |
Interest Income Recognized |  |  |  |  |
Impaired loans with no related allowance | 39 | 40 | 78 | 87 |
Residential |  |  |  |  |
Unpaid Principal Balance |  |  |  |  |
Impaired loans with no related allowance | 117 |  | 117 |  | 118
Impaired loans with related allowance | 1,976 |  | 1,976 |  | 1,958
Recorded Investment |  |  |  |  |
Impaired loans with no related allowance | 99 |  | 99 |  | 100
Impaired loans with related allowance | 1,953 |  | 1,953 |  | 1,907
Related Allowance | 362 |  | 362 |  | 362
Average Recorded Investment |  |  |  |  |
Impaired loans with no related allowance | 38 | 63 | 38 | 63 |
Impaired loans with related allowance | 2,021 | 1,714 | 2,029 | 1,726 |
Interest Income Recognized |  |  |  |  |
Impaired loans with no related allowance | 1 | 1 | 2 | 2 |
Impaired loans with related allowance | 16 | 12 | 32 | 24 |
Home equity |  |  |  |  |
Unpaid Principal Balance |  |  |  |  |
Impaired loans with no related allowance | 49 |  | 49 |  | 49
Impaired loans with related allowance | 366 |  | 366 |  | 376
Recorded Investment |  |  |  |  |
Impaired loans with no related allowance | 49 |  | 49 |  | 48
Impaired loans with related allowance | 349 |  | 349 |  | 358
Related Allowance | 70 |  | 70 |  | 74
Average Recorded Investment |  |  |  |  |
Impaired loans with no related allowance | 49 |  | 49 |  |
Impaired loans with related allowance | 351 | 302 | 352 | 303 |
Interest Income Recognized |  |  |  |  |
Impaired loans with no related allowance |  |  | 0 |  |
Impaired loans with related allowance | 3 | 2 | 6 | 5 |
Individuals' loans for household and other personal expenditures |  |  |  |  |
Unpaid Principal Balance |  |  |  |  |
Impaired loans with related allowance | 14 |  | 14 |  | 18
Recorded Investment |  |  |  |  |
Impaired loans with related allowance | 14 |  | 14 |  | 18
Related Allowance | 1 |  | 1 |  | 1
Average Recorded Investment |  |  |  |  |
Impaired loans with no related allowance |  | 10 |  | 11 |
Impaired loans with related allowance | 14 |  | 15 |  |
Interest Income Recognized |  |  |  |  |
Impaired loans with no related allowance |  | 0 |  | 0 |
Impaired loans with related allowance |  |  | 0 |  |
Public finance and other commercial loans |  |  |  |  |
Unpaid Principal Balance |  |  |  |  |
Impaired loans with no related allowance | 353 |  | 353 |  | 353
Recorded Investment |  |  |  |  |
Impaired loans with no related allowance | 353 |  | 353 |  | $ 353
Average Recorded Investment |  |  |  |  |
Impaired loans with no related allowance | $ 353 | 0 | 353 | 0 |
Interest Income Recognized |  |  |  |  |
Impaired loans with no related allowance |  | $ 0 | $ 0 | $ 0 |

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