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Loans, Impaired Financing Receivable (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Impaired Financing Receivable [Abstract] |  |  |  |  |
Unpaid Principal Balance | $ 28,594 |  | $ 28,594 |  | $ 28,887
Recorded Investment With No Allowance | 17,823 |  | 17,823 |  | 21,756
Recorded Investment With Allowance | 7,094 |  | 7,094 |  | 2,642
Total Recorded Investment | 24,917 |  | 24,917 |  | 24,398
Related Allowance | 654 |  | 654 |  | 410
Average Recorded Investment | 25,198 | $ 24,057 | 24,769 | $ 21,875 |
Interest Income Recognized | 182 | 217 | 604 | 568 |
Interest Income Recognized Cash Basis | 6 | 27 | 14 | 57 |
Real Estate Loans [Member] | Mortgages [Member] |  |  |  |  |
Impaired Financing Receivable [Abstract] |  |  |  |  |
Unpaid Principal Balance | 939 |  | 939 |  | 1,055
Recorded Investment With No Allowance | 360 |  | 360 |  | 273
Recorded Investment With Allowance | 466 |  | 466 |  | 700
Total Recorded Investment | 826 |  | 826 |  | 973
Related Allowance | 12 |  | 12 |  | 47
Average Recorded Investment | 896 | 741 | 988 | 874 |
Interest Income Recognized | 3 | 3 | 10 | 9 |
Interest Income Recognized Cash Basis | 0 | 0 | 0 | 0 |
Real Estate Loans [Member] | Home Equity [Member] |  |  |  |  |
Impaired Financing Receivable [Abstract] |  |  |  |  |
Unpaid Principal Balance | 108 |  | 108 |  | 92
Recorded Investment With No Allowance | 12 |  | 12 |  | 40
Recorded Investment With Allowance | 77 |  | 77 |  | 52
Total Recorded Investment | 89 |  | 89 |  | 92
Related Allowance | 15 |  | 15 |  | 9
Average Recorded Investment | 92 | 70 | 98 | 62 |
Interest Income Recognized | 2 | 1 | 4 | 3 |
Interest Income Recognized Cash Basis | 0 | 0 | 0 | 0 |
Real Estate Loans [Member] | Commercial [Member] |  |  |  |  |
Impaired Financing Receivable [Abstract] |  |  |  |  |
Unpaid Principal Balance | 17,043 |  | 17,043 |  | 16,363
Recorded Investment With No Allowance | 12,595 |  | 12,595 |  | 13,154
Recorded Investment With Allowance | 1,553 |  | 1,553 |  | 710
Total Recorded Investment | 14,148 |  | 14,148 |  | 13,864
Related Allowance | 224 |  | 224 |  | 94
Average Recorded Investment | 14,116 | 13,663 | 13,915 | 10,812 |
Interest Income Recognized | 130 | 122 | 372 | 280 |
Interest Income Recognized Cash Basis | 6 | 2 | 14 | 5 |
Real Estate Loans [Member] | Agricultural [Member] |  |  |  |  |
Impaired Financing Receivable [Abstract] |  |  |  |  |
Unpaid Principal Balance | 5,050 |  | 5,050 |  | 5,231
Recorded Investment With No Allowance | 1,752 |  | 1,752 |  | 3,283
Recorded Investment With Allowance | 3,286 |  | 3,286 |  | 618
Total Recorded Investment | 5,038 |  | 5,038 |  | 3,901
Related Allowance | 86 |  | 86 |  | 3
Average Recorded Investment | 5,146 | 3,799 | 4,472 | 3,609 |
Interest Income Recognized | 24 | 27 | 124 | 90 |
Interest Income Recognized Cash Basis | 0 | 0 | 0 | 0 |
Real Estate Loans [Member] | Construction [Member] |  |  |  |  |
Impaired Financing Receivable [Abstract] |  |  |  |  |
Unpaid Principal Balance | 0 |  | 0 |  | 0
Recorded Investment With No Allowance | 0 |  | 0 |  | 0
Recorded Investment With Allowance | 0 |  | 0 |  | 0
Total Recorded Investment | 0 |  | 0 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 0 | 0 | 0 | 0 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Income Recognized Cash Basis | 0 | 0 | 0 | 0 |
Consumer [Member] |  |  |  |  |
Impaired Financing Receivable [Abstract] |  |  |  |  |
Unpaid Principal Balance | 0 |  | 0 |  | 10
Recorded Investment With No Allowance | 0 |  | 0 |  | 2
Recorded Investment With Allowance | 0 |  | 0 |  | 6
Total Recorded Investment | 0 |  | 0 |  | 8
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 0 | 4 | 2 | 2 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Income Recognized Cash Basis | 0 | 0 | 0 | 0 |
Other Commercial Loans [Member] |  |  |  |  |
Impaired Financing Receivable [Abstract] |  |  |  |  |
Unpaid Principal Balance | 3,956 |  | 3,956 |  | 4,739
Recorded Investment With No Allowance | 2,990 |  | 2,990 |  | 3,766
Recorded Investment With Allowance | 378 |  | 378 |  | 431
Total Recorded Investment | 3,368 |  | 3,368 |  | 4,197
Related Allowance | 152 |  | 152 |  | 231
Average Recorded Investment | 3,495 | 4,337 | 3,906 | 4,988 |
Interest Income Recognized | 21 | 54 | 73 | 131 |
Interest Income Recognized Cash Basis | 0 | 25 | 0 | 52 |
Other Agricultural Loans [Member] |  |  |  |  |
Impaired Financing Receivable [Abstract] |  |  |  |  |
Unpaid Principal Balance | 1,498 |  | 1,498 |  | 1,397
Recorded Investment With No Allowance | 114 |  | 114 |  | 1,238
Recorded Investment With Allowance | 1,334 |  | 1,334 |  | 125
Total Recorded Investment | 1,448 |  | 1,448 |  | 1,363
Related Allowance | 165 |  | 165 |  | 26
Average Recorded Investment | 1,453 | 1,443 | 1,388 | 1,528 |
Interest Income Recognized | 2 | 10 | 21 | 55 |
Interest Income Recognized Cash Basis | 0 | 0 | 0 | 0 |
State and Political Subdivision Loans [Member] |  |  |  |  |
Impaired Financing Receivable [Abstract] |  |  |  |  |
Unpaid Principal Balance | 0 |  | 0 |  | 0
Recorded Investment With No Allowance | 0 |  | 0 |  | 0
Recorded Investment With Allowance | 0 |  | 0 |  | 0
Total Recorded Investment | 0 |  | 0 |  | 0
Related Allowance | 0 |  | 0 |  | $ 0
Average Recorded Investment | 0 | 0 | 0 | 0 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Interest Income Recognized Cash Basis | $ 0 | $ 0 | $ 0 | $ 0 |

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