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Loans and Allowance for Credit Losses - Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2012
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment, With no related allowance recorded | $ 5,296 | $ 1,554 |  |
Upaid Principal Balance, With no related allowance recorded | 5,884 | 1,933 |  |
Cash flows expected to be collected at acquisition | 1,070 | 3,715 |  |
Unpaid Principal Balance, With an allowance recorded | 1,070 | 3,784 |  |
Related Allowance | 36 | 307 |  |
Total Recorded Investment | 6,366 | 5,269 |  |
Total Unpaid Principal Balance | 6,954 | 5,717 |  |
Average Recorded Investment, With no related allowance recorded | 3,164 | 4,427 | $ 8,965 |
Interest Income Recognized, With no related allowance recorded | 167 | 251 | 310 |
Average Recorded Investment, With an allowance recorded | 2,618 | 1,606 | 3,827 |
Interest Income Recognized, With an allowance recorded | 36 | 3 | 0 |
Average Recorded Investment, Total | 5,782 | 6,033 | 12,792 |
Interest Income Recognized, Total | 203 | 254 | 310 |
Forgone interest on nonaccrual loans | 210 | 245 | 340 |
Commercial |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, With no related allowance recorded | 404 | 157 | 2,921 |
Interest Income Recognized, With no related allowance recorded | 0 | 0 | 0 |
Average Recorded Investment, With an allowance recorded | 38 | 545 | 243 |
Interest Income Recognized, With an allowance recorded | 1 | 3 | 0 |
Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment, With no related allowance recorded | 355 | 447 |  |
Upaid Principal Balance, With no related allowance recorded | 553 | 612 |  |
Cash flows expected to be collected at acquisition | 22 | 40 |  |
Unpaid Principal Balance, With an allowance recorded | 22 | 40 |  |
Related Allowance | 1 | 3 |  |
Average Recorded Investment, With no related allowance recorded | 404 | 115 | 2,921 |
Interest Income Recognized, With no related allowance recorded | 0 | 0 | 0 |
Average Recorded Investment, With an allowance recorded | 38 | 441 | 243 |
Interest Income Recognized, With an allowance recorded | 1 | 3 | 0 |
Commercial | Agricultural land and production |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, With no related allowance recorded | 0 | 42 | 0 |
Interest Income Recognized, With no related allowance recorded | 0 | 0 | 0 |
Average Recorded Investment, With an allowance recorded | 0 | 104 | 0 |
Interest Income Recognized, With an allowance recorded | 0 | 0 | 0 |
Real Estate |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment, With no related allowance recorded | 4,795 | 934 |  |
Upaid Principal Balance, With no related allowance recorded | 5,125 | 1,078 |  |
Cash flows expected to be collected at acquisition |  | 3,304 |  |
Unpaid Principal Balance, With an allowance recorded |  | 3,368 |  |
Related Allowance |  | 241 |  |
Average Recorded Investment, With no related allowance recorded | 2,622 | 3,631 | 4,186 |
Interest Income Recognized, With no related allowance recorded | 167 | 251 | 310 |
Average Recorded Investment, With an allowance recorded | 2,340 | 839 | 3,240 |
Interest Income Recognized, With an allowance recorded | 3 | 0 | 0 |
Real Estate | Owner occupied |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment, With no related allowance recorded |  | 107 |  |
Upaid Principal Balance, With no related allowance recorded |  | 111 |  |
Average Recorded Investment, With no related allowance recorded | 24 | 162 | 770 |
Interest Income Recognized, With no related allowance recorded | 0 | 0 | 231 |
Average Recorded Investment, With an allowance recorded | 0 | 120 | 190 |
Interest Income Recognized, With an allowance recorded | 0 | 0 | 0 |
Real Estate | Real estate construction and other land loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment, With no related allowance recorded | 3,023 |  |  |
Upaid Principal Balance, With no related allowance recorded | 3,085 |  |  |
Cash flows expected to be collected at acquisition |  | 2,222 |  |
Unpaid Principal Balance, With an allowance recorded |  | 2,222 |  |
Related Allowance |  | 79 |  |
Average Recorded Investment, With no related allowance recorded | 1,228 | 2,393 | 1,266 |
Interest Income Recognized, With no related allowance recorded | 114 | 196 | 79 |
Average Recorded Investment, With an allowance recorded | 1,827 | 171 | 2,297 |
Interest Income Recognized, With an allowance recorded | 0 | 0 | 0 |
Real Estate | Commercial real estate |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment, With no related allowance recorded | 1,772 | 827 |  |
Upaid Principal Balance, With no related allowance recorded | 2,040 | 967 |  |
Cash flows expected to be collected at acquisition |  | 1,082 |  |
Unpaid Principal Balance, With an allowance recorded |  | 1,146 |  |
Related Allowance |  | 162 |  |
Average Recorded Investment, With no related allowance recorded | 1,370 | 903 | 1,939 |
Interest Income Recognized, With no related allowance recorded | 53 | 55 | 0 |
Average Recorded Investment, With an allowance recorded | 470 | 548 | 753 |
Interest Income Recognized, With an allowance recorded | 0 | 0 | 0 |
Real Estate | Agricultural real estate |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Cash flows expected to be collected at acquisition | 51 |  |  |
Unpaid Principal Balance, With an allowance recorded | 51 |  |  |
Related Allowance | 1 |  |  |
Average Recorded Investment, With no related allowance recorded | 0 | 173 | 211 |
Interest Income Recognized, With no related allowance recorded | 0 | 0 | 0 |
Average Recorded Investment, With an allowance recorded | 43 | 0 |  | $ 0
Interest Income Recognized, With an allowance recorded | 3 | 0 |  | $ 0
Consumer |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment, With no related allowance recorded |  | 173 |  |
Upaid Principal Balance, With no related allowance recorded |  | 243 |  |
Cash flows expected to be collected at acquisition |  | 371 |  |
Unpaid Principal Balance, With an allowance recorded |  | 376 |  |
Related Allowance |  | 63 |  |
Average Recorded Investment, With no related allowance recorded | 138 | 639 | 1,858 |
Interest Income Recognized, With no related allowance recorded | 0 | 0 | 0 |
Average Recorded Investment, With an allowance recorded | 240 | 222 | 344 |
Interest Income Recognized, With an allowance recorded | 32 | 0 | 0 |
Consumer | Equity loans and lines of credit |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment, With no related allowance recorded | 146 | 167 |  |
Upaid Principal Balance, With no related allowance recorded | 206 | 234 |  |
Cash flows expected to be collected at acquisition | 997 | 359 |  |
Unpaid Principal Balance, With an allowance recorded | 997 | 364 |  |
Related Allowance | 34 | 61 |  |
Average Recorded Investment, With no related allowance recorded | 132 | 598 | 1,858 |
Interest Income Recognized, With no related allowance recorded | 0 | 0 | 0 |
Average Recorded Investment, With an allowance recorded | 239 | 203 | 328 |
Interest Income Recognized, With an allowance recorded | 32 | 0 | 0 |
Consumer | Consumer and installment |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment, With no related allowance recorded |  | 6 |  |
Upaid Principal Balance, With no related allowance recorded |  | 9 |  |
Cash flows expected to be collected at acquisition |  | 12 |  |
Unpaid Principal Balance, With an allowance recorded |  | 12 |  |
Related Allowance |  | 2 |  |
Average Recorded Investment, With no related allowance recorded | 6 | 41 | 0 |
Interest Income Recognized, With no related allowance recorded | 0 | 0 | 0 |
Average Recorded Investment, With an allowance recorded | 1 | 19 | 16 |
Interest Income Recognized, With an allowance recorded | $ 0 | $ 0 | $ 0 |

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