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Note 4 - Credit Quality - Loans Modified as Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($)
Below Market Interest Rate and Extended Payment Term [Member] |  |  |
Total contracts |  | 3 |
Pre-modification recorded investment |  | $ 678 |
Post-modification recorded investment |  | $ 676 |
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Owner Occupied [Member] |  |  |
Total contracts |  | 2 |
Pre-modification recorded investment |  | $ 374 |
Post-modification recorded investment | [1] | $ 372 |
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Non-owner Occupied [Member] |  |  |
Total contracts |  | 1 |
Pre-modification recorded investment |  | $ 304 |
Post-modification recorded investment | [1] | $ 304 |
Below Market Interest Rate and Extended Payment Term [Member] | Consumer Loans [Member] |  |  |
Total contracts |  |  |
Pre-modification recorded investment |  |  |
Post-modification recorded investment |  |  |
Below Market Interest Rate and Extended Payment Term [Member] | Other Receivables [Member] |  |  |
Total contracts |  |  |
Pre-modification recorded investment |  |  |
Post-modification recorded investment |  |  |
Payment Deferral [Member] |  |  |
Total contracts |  | 2 |
Pre-modification recorded investment |  | $ 70 |
Post-modification recorded investment |  | $ 53 |
Payment Deferral [Member] | Single Family Owner Occupied [Member] |  |  |
Total contracts |  | 1 |
Pre-modification recorded investment |  | $ 66 |
Post-modification recorded investment |  | $ 49 |
Payment Deferral [Member] | Home Equity Lines [Member] |  |  |
Total contracts |  | 1 |
Pre-modification recorded investment |  | $ 4 |
Post-modification recorded investment |  | $ 4 |
[1] | Represents the loan balance immediately following modification

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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- Definition Amount, before troubled debt restructuring, of financing receivable to be modified. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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