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Loans and Allowance - Composition of Impaired Loans by Loan Class (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Unpaid Principal Balance |  |  |
Impaired loans with no related allowance | $ 9,955 | $ 14,555 | $ 25,979
Impaired loans with related allowance | 5,139 | 10,501 | 6,123
Total Impaired Loans | 15,094 | 25,056 | 32,102
Recorded Investment |  |  |
Impaired loans with no related allowance | 7,352 | 11,594 | 17,931
Impaired loans with related allowance | 4,357 | 10,431 | 5,280
Total Impaired Loans | 11,709 | 22,025 | 23,211
Related Allowance | 689 | 1,872 | 1,637
Average Recorded Investment |  |  |
Impaired loans with no related allowance | 7,924 | 15,824 | 22,752
Impaired loans with related allowance | 4,405 | 10,448 | 6,135
Total Impaired Loans | 12,329 | 26,272 | 28,887
Interest Income Recognized |  |  |
Impaired loans with no related allowance | 159 | 168 | 360
Impaired loans with related allowance | 75 | 68 | 39
Total Impaired Loans | 234 | 236 | 399
Commercial and industrial loans |  |  |
Unpaid Principal Balance |  |  |
Impaired loans with no related allowance | 320 | 828 | 7,611
Impaired loans with related allowance |  |  | 812
Recorded Investment |  |  |
Impaired loans with no related allowance | 320 | 806 | 1,536
Impaired loans with related allowance |  |  | 782
Related Allowance |  |  | 552
Average Recorded Investment |  |  |
Impaired loans with no related allowance | 320 | 833 | 3,839
Impaired loans with related allowance |  |  | 1,517
Interest Income Recognized |  |  |
Impaired loans with no related allowance | 0 | 0 | 0
Impaired loans with related allowance |  |  | 0
Agriculture production financing and other loans to farmers |  |  |
Unpaid Principal Balance |  |  |
Impaired loans with no related allowance | 299 | 679 | 732
Impaired loans with related allowance |  |  | 357
Recorded Investment |  |  |
Impaired loans with no related allowance | 137 | 679 | 700
Impaired loans with related allowance |  |  | 327
Related Allowance |  |  | 114
Average Recorded Investment |  |  |
Impaired loans with no related allowance | 298 | 679 | 762
Impaired loans with related allowance |  |  | 327
Interest Income Recognized |  |  |
Impaired loans with no related allowance | 0 | 0 | 0
Impaired loans with related allowance |  |  | 0
Construction |  |  |
Unpaid Principal Balance |  |  |
Impaired loans with no related allowance | 1,206 | 1,352 |
Impaired loans with related allowance |  | 7,978 |
Recorded Investment |  |  |
Impaired loans with no related allowance | 970 | 614 |
Impaired loans with related allowance |  | 7,977 |
Related Allowance |  | 1,429 |
Average Recorded Investment |  |  |
Impaired loans with no related allowance | 1,229 | 835 |
Impaired loans with related allowance |  | 7,977 |
Interest Income Recognized |  |  |
Impaired loans with no related allowance | 0 | 0 |
Impaired loans with related allowance |  | 0 |
Commercial and farmland |  |  |
Unpaid Principal Balance |  |  |
Impaired loans with no related allowance | 8,037 | 11,176 | 16,758
Impaired loans with related allowance | 2,648 | 171 | 2,988
Recorded Investment |  |  |
Impaired loans with no related allowance | 5,849 | 8,994 | 15,163
Impaired loans with related allowance | 1,909 | 171 | 2,269
Related Allowance | 231 | 6 | 567
Average Recorded Investment |  |  |
Impaired loans with no related allowance | 6,000 | 12,975 | 17,495
Impaired loans with related allowance | 1,909 | 171 | 2,379
Interest Income Recognized |  |  |
Impaired loans with no related allowance | 156 | 165 | 360
Impaired loans with related allowance | 0 | 0 | 0
Residential |  |  |
Unpaid Principal Balance |  |  |
Impaired loans with no related allowance | 93 | 118 | 833
Impaired loans with related allowance | 2,070 | 1,958 | 1,616
Recorded Investment |  |  |
Impaired loans with no related allowance | 76 | 100 | 519
Impaired loans with related allowance | 2,044 | 1,907 | 1,572
Related Allowance | 383 | 362 | 327
Average Recorded Investment |  |  |
Impaired loans with no related allowance | 77 | 101 | 635
Impaired loans with related allowance | 2,083 | 1,915 | 1,580
Interest Income Recognized |  |  |
Impaired loans with no related allowance | 3 | 3 | 0
Impaired loans with related allowance | 63 | 57 | 28
Home equity |  |  |
Unpaid Principal Balance |  |  |
Impaired loans with no related allowance |  | 49 | 40
Impaired loans with related allowance | 417 | 376 | 350
Recorded Investment |  |  |
Impaired loans with no related allowance |  | 48 | 8
Impaired loans with related allowance | 400 | 358 | 330
Related Allowance | 75 | 74 | 77
Average Recorded Investment |  |  |
Impaired loans with no related allowance |  | 48 | 14
Impaired loans with related allowance | 409 | 365 | 332
Interest Income Recognized |  |  |
Impaired loans with no related allowance |  | 0 | 0
Impaired loans with related allowance | 12 | 10 | 11
Individuals' loans for household and other personal expenditures |  |  |
Unpaid Principal Balance |  |  |
Impaired loans with no related allowance |  |  | 5
Impaired loans with related allowance | 4 | 18 |
Recorded Investment |  |  |
Impaired loans with no related allowance |  |  | 5
Impaired loans with related allowance | 4 | 18 |
Related Allowance | 0 | 1 |
Average Recorded Investment |  |  |
Impaired loans with no related allowance |  |  | 7
Impaired loans with related allowance | 4 | 20 |
Interest Income Recognized |  |  |
Impaired loans with no related allowance |  |  | $ 0
Impaired loans with related allowance | $ 0 | 1 |
Public finance and other commercial loans |  |  |
Unpaid Principal Balance |  |  |
Impaired loans with no related allowance |  | 353 |
Recorded Investment |  |  |
Impaired loans with no related allowance |  | 353 |
Average Recorded Investment |  |  |
Impaired loans with no related allowance |  | 353 |
Interest Income Recognized |  |  |
Impaired loans with no related allowance |  | $ 0 |

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