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Loans and Allowance - Composition of Impaired Loans by Loan Class (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Unpaid Principal Balance |  |  |
Impaired loans with no related allowance | $ 9,101 | $ 9,955 | $ 14,555
Impaired loans with related allowance | 49,513 | 5,139 | 10,501
Total Impaired Loans | 58,614 | 15,094 | 25,056
Recorded Investment |  |  |
Impaired loans with no related allowance | 7,813 | 7,352 | 11,594
Impaired loans with related allowance | 48,343 | 4,357 | 10,431
Total Impaired Loans | 56,156 | 11,709 | 22,025
Related Allowance | 12,901 | 689 | 1,872
Average Recorded Investment |  |  |
Impaired loans with no related allowance | 8,113 | 7,924 | 15,824
Impaired loans with related allowance | 49,003 | 4,405 | 10,448
Total Impaired Loans | 57,116 | 12,329 | 26,272
Interest Income Recognized |  |  |
Impaired loans with no related allowance | 148 | 159 | 168
Impaired loans with related allowance | 84 | 75 | 68
Total Impaired Loans | 232 | 234 | 236
Commercial and industrial loans |  |  |
Unpaid Principal Balance |  |  |
Impaired loans with no related allowance | 1,059 | 320 | 828
Impaired loans with related allowance | 268 |  |
Recorded Investment |  |  |
Impaired loans with no related allowance | 991 | 320 | 806
Impaired loans with related allowance | 268 |  |
Related Allowance | 223 |  |
Average Recorded Investment |  |  |
Impaired loans with no related allowance | 991 | 320 | 833
Impaired loans with related allowance | 267 |  |
Interest Income Recognized |  |  |
Impaired loans with no related allowance | 0 | 0 | 0
Impaired loans with related allowance | 0 |  |
Agricultural land, production and other loans to farmers |  |  |
Unpaid Principal Balance |  |  |
Impaired loans with no related allowance |  | 752 | 679
Impaired loans with related allowance | 640 | 588 |
Recorded Investment |  |  |
Impaired loans with no related allowance |  | 381 | 679
Impaired loans with related allowance | 562 | 585 |
Related Allowance | 3 | 107 |
Average Recorded Investment |  |  |
Impaired loans with no related allowance |  | 542 | 1,213
Impaired loans with related allowance | 589 | 585 |
Interest Income Recognized |  |  |
Impaired loans with no related allowance |  | 0 | 0
Impaired loans with related allowance | 0 | 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 real estate, non-owner occupied |  |  |
Unpaid Principal Balance |  |  |
Impaired loans with no related allowance | 4,958 | 6,202 | 7,795
Impaired loans with related allowance | 44,016 |  |
Recorded Investment |  |  |
Impaired loans with no related allowance | 4,694 | 5,299 | 6,891
Impaired loans with related allowance | 43,715 |  |
Related Allowance | 11,686 |  |
Average Recorded Investment |  |  |
Impaired loans with no related allowance | 4,850 | 5,399 | 10,239
Impaired loans with related allowance | 44,119 |  |
Interest Income Recognized |  |  |
Impaired loans with no related allowance | 145 | 156 | 0
Impaired loans with related allowance | 0 |  |
Commercial real estate, owner occupied |  |  |
Unpaid Principal Balance |  |  |
Impaired loans with no related allowance | 2,125 | 1,382 | 3,381
Impaired loans with related allowance | 2,061 | 2,060 | 171
Recorded Investment |  |  |
Impaired loans with no related allowance | 1,310 | 306 | 2,103
Impaired loans with related allowance | 1,323 | 1,324 | 171
Related Allowance | 557 | 124 | 6
Average Recorded Investment |  |  |
Impaired loans with no related allowance | 1,429 | 357 | 2,202
Impaired loans with related allowance | 1,447 | 1,324 | 171
Interest Income Recognized |  |  |
Impaired loans with no related allowance | 0 | 0 | 165
Impaired loans with related allowance | 0 | 0 |
Residential |  |  |
Unpaid Principal Balance |  |  |
Impaired loans with no related allowance | 957 | 93 | 118
Impaired loans with related allowance | 2,041 | 2,070 | 1,958
Recorded Investment |  |  |
Impaired loans with no related allowance | 816 | 76 | 100
Impaired loans with related allowance | 2,014 | 2,044 | 1,907
Related Allowance | 352 | 383 | 362
Average Recorded Investment |  |  |
Impaired loans with no related allowance | 840 | 77 | 101
Impaired loans with related allowance | 2,108 | 2,083 | 1,915
Interest Income Recognized |  |  |
Impaired loans with no related allowance | 3 | 3 | 3
Impaired loans with related allowance | 70 | 63 | 57
Home equity |  |  |
Unpaid Principal Balance |  |  |
Impaired loans with no related allowance |  |  | 49
Impaired loans with related allowance | 487 | 417 | 376
Recorded Investment |  |  |
Impaired loans with no related allowance |  |  | 48
Impaired loans with related allowance | 461 | 400 | 358
Related Allowance | 80 | 75 | 74
Average Recorded Investment |  |  |
Impaired loans with no related allowance |  |  | 48
Impaired loans with related allowance | 473 | 409 | 365
Interest Income Recognized |  |  |
Impaired loans with no related allowance |  |  | 0
Impaired loans with related allowance | 14 | 12 | 10
Individuals' loans for household and other personal expenditures |  |  |
Unpaid Principal Balance |  |  |
Impaired loans with no related allowance | 2 |  |
Impaired loans with related allowance |  | 4 | 18
Recorded Investment |  |  |
Impaired loans with no related allowance | 2 |  |
Impaired loans with related allowance |  | 4 | 18
Related Allowance |  | 0 | 1
Average Recorded Investment |  |  |
Impaired loans with no related allowance | 3 |  |
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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