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Note D - Loans and Allowance for Loan Losses - TDRs Pre-modification and Post-modification (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Number of Loans | 2 | 2
Performing Financial Instruments [Member] |  |
Pre-modification recorded investment | $ 1,409 | $ 574
Post-modification recorded investment | 1,409 | 574
Nonperforming Financial Instruments [Member] |  |
Pre-modification recorded investment |  | 226
Post-modification recorded investment |  | $ 226
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Interest Only Payments [Member] |  |
Number of Loans | 1 |
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Interest Only Payments [Member] | Performing Financial Instruments [Member] |  |
Pre-modification recorded investment | $ 997 |
Post-modification recorded investment | 997 |
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Interest Only Payments [Member] | Nonperforming Financial Instruments [Member] |  |
Pre-modification recorded investment |  |
Post-modification recorded investment |  |
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Interest Rate Below Market Reduction [Member] |  |
Number of Loans | 1 |
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Interest Rate Below Market Reduction [Member] | Performing Financial Instruments [Member] |  |
Pre-modification recorded investment | $ 412 |
Post-modification recorded investment | 412 |
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Interest Rate Below Market Reduction [Member] | Nonperforming Financial Instruments [Member] |  |
Pre-modification recorded investment |  |
Post-modification recorded investment |  |
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Only Payments [Member] |  |
Number of Loans |  | 1
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Only Payments [Member] | Performing Financial Instruments [Member] |  |
Pre-modification recorded investment |  |
Post-modification recorded investment |  |
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Only Payments [Member] | Nonperforming Financial Instruments [Member] |  |
Pre-modification recorded investment |  | 226
Post-modification recorded investment |  | $ 226
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Rate Below Market Reduction [Member] |  |
Number of Loans |  | 1
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Rate Below Market Reduction [Member] | Performing Financial Instruments [Member] |  |
Pre-modification recorded investment |  | $ 574
Post-modification recorded investment |  | 574
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Rate Below Market Reduction [Member] | Nonperforming Financial Instruments [Member] |  |
Pre-modification recorded investment |  |
Post-modification recorded investment |  |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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