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Note 4 - Loans and Allowance for Loan Losses - TDRs Pre-modification and Post-modification (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 USD ($) | Sep. 30, 2018 | Sep. 30, 2017 USD ($)
Number of Loans | 0 | 1 | 0 | 4
Performing Financial Instruments [Member] |  |  |  |
Pre-modification recorded investment |  | $ 412 |  | $ 1,413
Post-modification recorded investment |  | 412 |  | 1,413
Nonperforming Financial Instruments [Member] |  |  |  |
Pre-modification recorded investment |  |  |  |
Post-modification recorded investment |  |  |  |
Residential Portfolio Segment [Member] | Maturity Extension at Lower Stated Rate Than Market Rate [Member] |  |  |  |
Number of Loans |  |  |  | 1
Residential Portfolio Segment [Member] | Maturity Extension at Lower Stated Rate Than Market Rate [Member] | Performing Financial Instruments [Member] |  |  |  |
Pre-modification recorded investment |  |  |  | $ 231
Post-modification recorded investment |  |  |  | 231
Residential Portfolio Segment [Member] | Maturity Extension at Lower Stated Rate Than Market Rate [Member] | Nonperforming Financial Instruments [Member] |  |  |  |
Pre-modification recorded investment |  |  |  |
Post-modification recorded investment |  |  |  |
Commercial Real Estate Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |  |
Number of Loans |  | 1 |  | 1
Commercial Real Estate Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Owner Occupied [Member] | Performing Financial Instruments [Member] |  |  |  |
Pre-modification recorded investment |  | $ 412 |  | $ 412
Post-modification recorded investment |  | 412 |  | 412
Commercial Real Estate Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] | Commercial Real Estate Owner Occupied [Member] | Nonperforming Financial Instruments [Member] |  |  |  |
Pre-modification recorded investment |  |  |  |
Post-modification recorded investment |  |  |  |
Commercial and Industrial Portfolio Segment [Member] | Maturity Extension at Lower Stated Rate Than Market Rate [Member] |  |  |  |
Number of Loans |  |  |  | 2
Commercial and Industrial Portfolio Segment [Member] | Maturity Extension at Lower Stated Rate Than Market Rate [Member] | Performing Financial Instruments [Member] |  |  |  |
Pre-modification recorded investment |  |  |  | $ 770
Post-modification recorded investment |  |  |  | 770
Commercial and Industrial Portfolio Segment [Member] | Maturity Extension at Lower Stated Rate Than Market Rate [Member] | Nonperforming Financial Instruments [Member] |  |  |  |
Pre-modification recorded investment |  |  |  |
Post-modification recorded investment |  |  |  |

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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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