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Note 3 - Loans and Allowance for Loan Losses - Summary of Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Number of contracts | 3 | 1 | 4 | 1
Pre-modification outstanding balance | $ 390 | $ 65 | $ 569 | $ 65
Post-modification outstanding balance | $ 390 | $ 65 | $ 569 | $ 65
Commercial Portfolio Segment [Member] |  |  |  |
Number of contracts | 1 |  | 2 |
Pre-modification outstanding balance | $ 55 |  | $ 234 |
Post-modification outstanding balance | $ 55 |  | $ 234 |
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] |  |  |  |
Number of contracts | 1 | 1 | 1 | 1
Pre-modification outstanding balance | $ 241 | $ 65 | $ 241 | $ 65
Post-modification outstanding balance | $ 241 | $ 65 | $ 241 | $ 65
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] |  |  |  |
Number of contracts | 1 |  | 1 |
Pre-modification outstanding balance | $ 94 |  | $ 94 |
Post-modification outstanding balance | $ 94 |  | $ 94 |

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