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Note 3 - Loans and Allowance for Loan Losses - Summary of Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 USD ($) | Jun. 30, 2017
Number of contracts | 0 | 0 | 1 | 0
Pre-modification outstanding balance |  |  | $ 179 |
Post-modification outstanding balance |  |  | $ 179 |
Commercial Portfolio Segment [Member] |  |  |  |
Number of contracts |  |  | 1 |
Pre-modification outstanding balance |  |  | $ 179 |
Post-modification outstanding balance |  |  | $ 179 |

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