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Loans, Impaired Financing Receivable (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Impaired Financing Receivable [Abstract] |  |  |
Unpaid Principal Balance | $ 27,862 |  | $ 28,887
Recorded Investment With No Allowance | 21,548 |  | 21,756
Recorded Investment With Allowance | 2,972 |  | 2,642
Total Recorded Investment | 24,520 |  | 24,398
Related Allowance | 408 |  | 410
Average Recorded Investment | 24,541 | $ 17,350 |
Interest Income Recognized | 214 | 122 |
Interest Income Recognized Cash Basis | 5 | 13 |
Real Estate Loans [Member] | Mortgages [Member] |  |  |
Impaired Financing Receivable [Abstract] |  |  |
Unpaid Principal Balance | 1,227 |  | 1,055
Recorded Investment With No Allowance | 268 |  | 273
Recorded Investment With Allowance | 870 |  | 700
Total Recorded Investment | 1,138 |  | 973
Related Allowance | 22 |  | 47
Average Recorded Investment | 1,023 | 894 |
Interest Income Recognized | 4 | 3 |
Interest Income Recognized Cash Basis | 0 | 0 |
Real Estate Loans [Member] | Home Equity [Member] |  |  |
Impaired Financing Receivable [Abstract] |  |  |
Unpaid Principal Balance | 112 |  | 92
Recorded Investment With No Allowance | 39 |  | 40
Recorded Investment With Allowance | 57 |  | 52
Total Recorded Investment | 96 |  | 92
Related Allowance | 16 |  | 9
Average Recorded Investment | 107 | 56 |
Interest Income Recognized | 1 | 1 |
Interest Income Recognized Cash Basis | 0 | 0 |
Real Estate Loans [Member] | Commercial [Member] |  |  |
Impaired Financing Receivable [Abstract] |  |  |
Unpaid Principal Balance | 16,625 |  | 16,363
Recorded Investment With No Allowance | 12,589 |  | 13,154
Recorded Investment With Allowance | 1,360 |  | 710
Total Recorded Investment | 13,949 |  | 13,864
Related Allowance | 170 |  | 94
Average Recorded Investment | 13,795 | 5,793 |
Interest Income Recognized | 122 | 24 |
Interest Income Recognized Cash Basis | 5 | 3 |
Real Estate Loans [Member] | Agricultural [Member] |  |  |
Impaired Financing Receivable [Abstract] |  |  |
Unpaid Principal Balance | 3,824 |  | 5,231
Recorded Investment With No Allowance | 3,682 |  | 3,283
Recorded Investment With Allowance | 136 |  | 618
Total Recorded Investment | 3,818 |  | 3,901
Related Allowance | 5 |  | 3
Average Recorded Investment | 4,086 | 3,382 |
Interest Income Recognized | 51 | 31 |
Interest Income Recognized Cash Basis | 0 | 0 |
Real Estate Loans [Member] | Construction [Member] |  |  |
Impaired Financing Receivable [Abstract] |  |  |
Unpaid Principal Balance | 0 |  | 0
Recorded Investment With No Allowance | 0 |  | 0
Recorded Investment With Allowance | 0 |  | 0
Total Recorded Investment | 0 |  | 0
Related Allowance | 0 |  | 0
Average Recorded Investment | 0 | 0 |
Interest Income Recognized | 0 | 0 |
Interest Income Recognized Cash Basis | 0 | 0 |
Consumer [Member] |  |  |
Impaired Financing Receivable [Abstract] |  |  |
Unpaid Principal Balance | 0 |  | 10
Recorded Investment With No Allowance | 0 |  | 2
Recorded Investment With Allowance | 0 |  | 6
Total Recorded Investment | 0 |  | 8
Related Allowance | 0 |  | 0
Average Recorded Investment | 4 | 1 |
Interest Income Recognized | 0 | 0 |
Interest Income Recognized Cash Basis | 0 | 0 |
Other Commercial Loans [Member] |  |  |
Impaired Financing Receivable [Abstract] |  |  |
Unpaid Principal Balance | 4,655 |  | 4,739
Recorded Investment With No Allowance | 3,721 |  | 3,766
Recorded Investment With Allowance | 418 |  | 431
Total Recorded Investment | 4,139 |  | 4,197
Related Allowance | 184 |  | 231
Average Recorded Investment | 4,156 | 5,597 |
Interest Income Recognized | 26 | 40 |
Interest Income Recognized Cash Basis | 0 | 10 |
Other Agricultural Loans [Member] |  |  |
Impaired Financing Receivable [Abstract] |  |  |
Unpaid Principal Balance | 1,419 |  | 1,397
Recorded Investment With No Allowance | 1,249 |  | 1,238
Recorded Investment With Allowance | 131 |  | 125
Total Recorded Investment | 1,380 |  | 1,363
Related Allowance | 11 |  | 26
Average Recorded Investment | 1,370 | 1,627 |
Interest Income Recognized | 10 | 23 |
Interest Income Recognized Cash Basis | 0 | 0 |
State and Political Subdivision Loans [Member] |  |  |
Impaired Financing Receivable [Abstract] |  |  |
Unpaid Principal Balance | 0 |  | 0
Recorded Investment With No Allowance | 0 |  | 0
Recorded Investment With Allowance | 0 |  | 0
Total Recorded Investment | 0 |  | 0
Related Allowance | 0 |  | $ 0
Average Recorded Investment | 0 | 0 |
Interest Income Recognized | 0 | 0 |
Interest Income Recognized Cash Basis | $ 0 | $ 0 |

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