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Loans and Allowance for Loan Losses, Impaired Loans and TDR's (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
Impaired Loans [Abstract] |  |  |  |  |
Unpaid principal balance | $ 9,869 |  | $ 9,869 |  | $ 10,821
Recorded investment with no allowance | 7,950 |  | 7,950 |  | 10,077
Recorded investment with an allowance | 1,919 |  | 1,919 |  | 506
Total recorded investment | 9,869 |  | 9,869 |  | 10,583
Related allowance | 35 |  | 35 |  | 46
Average recorded investment | 10,079 | $ 10,903 | 9,884 | $ 8,363 |
Interest income recognized | 136 | 159 | 349 | 342 |
Troubled Debt Restructurings [Abstract] |  |  |  |  |
TDR's loans impaired | 2,900 |  | 2,900 |  | 0
Troubled debt restructurings modified in three months that subsequently defaulted |  |  | 0 |  |
Construction & Development [Member] |  |  |  |  |
Impaired Loans [Abstract] |  |  |  |  |
Unpaid principal balance | 0 |  | 0 |  | 0
Recorded investment with no allowance | 0 |  | 0 |  | 0
Recorded investment with an 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 |
Commercial Loan [Member] |  |  |  |  |
Troubled Debt Restructurings [Abstract] |  |  |  |  |
TDR's loans impaired | 321 |  | 321 |  | 501
1-4 Family Commercial [Member] |  |  |  |  |
Impaired Loans [Abstract] |  |  |  |  |
Unpaid principal balance | 8 |  | 8 |  | 115
Recorded investment with no allowance | 0 |  | 0 |  | 115
Recorded investment with an allowance | 8 |  | 8 |  | 0
Total recorded investment | 8 |  | 8 |  | 115
Related allowance | 3 |  | 3 |  | 0
Average recorded investment | 713 | 71 | 414 | 90 |
Interest income recognized | 0 | 8 | 0 | 0 |
Commercial Real Estate - Other [Member] |  |  |  |  |
Impaired Loans [Abstract] |  |  |  |  |
Unpaid principal balance | 1,911 |  | 1,911 |  | 1,990
Recorded investment with no allowance | 0 |  | 0 |  | 1,506
Recorded investment with an allowance | 1,911 |  | 1,911 |  | 484
Total recorded investment | 1,911 |  | 1,911 |  | 1,990
Related allowance | 32 |  | 32 |  | 32
Average recorded investment | 1,335 | 414 | 1,147 | 500 |
Interest income recognized | 33 | 144 | 66 | 18 |
Troubled Debt Restructurings [Abstract] |  |  |  |  |
TDR's loans impaired | 1,911 |  | 1,911 |  |
Commercial & Industrial [Member] |  |  |  |  |
Impaired Loans [Abstract] |  |  |  |  |
Unpaid principal balance | 5,309 |  | 5,309 |  | 7,614
Recorded investment with no allowance | 5,309 |  | 5,309 |  | 7,359
Recorded investment with an allowance | 0 |  | 0 |  | 22
Total recorded investment | 5,309 |  | 5,309 |  | 7,381
Related allowance | 0 |  | 0 |  | 14
Average recorded investment | 5,290 | 8,880 | 5,940 | 6,207 |
Interest income recognized | 55 | 7 | 178 | 284 |
Troubled Debt Restructurings [Abstract] |  |  |  |  |
TDR's loans impaired | 2,200 |  | 2,200 |  | 501
Agricultural [Member] |  |  |  |  |
Impaired Loans [Abstract] |  |  |  |  |
Unpaid principal balance | 2,641 |  | 2,641 |  | 1,097
Recorded investment with no allowance | 2,641 |  | 2,641 |  | 1,097
Recorded investment with an allowance | 0 |  | 0 |  | 0
Total recorded investment | 2,641 |  | 2,641 |  | 1,097
Related allowance | 0 |  | 0 |  | 0
Average recorded investment | 2,548 | 1,497 | 2,190 | 1,529 |
Interest income recognized | 48 | 0 | 105 | 40 |
Troubled Debt Restructurings [Abstract] |  |  |  |  |
TDR's loans impaired | 674 |  | 674 |  |
Consumer [Member] |  |  |  |  |
Impaired Loans [Abstract] |  |  |  |  |
Unpaid principal balance | 0 |  | 0 |  | 5
Recorded investment with no allowance | 0 |  | 0 |  | 0
Recorded investment with an allowance | 0 |  | 0 |  | 0
Total recorded investment | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | $ 0
Average recorded investment | 193 | 41 | 193 | 37 |
Interest income recognized | $ 0 | $ 0 | $ 0 | $ 0 |

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