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Note 3 - Loans and Allowance for Loan Losses - Summary of Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017
Number of contracts | 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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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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