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Note 4 - Loans - Non-accrual Troubled Debt Restructurings (Details) - Non-accruing Troubled Debt Restructuring [Member] - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Accruing TDRs | $ 8,985 | $ 18,048 | $ 24,189 | $ 33,416
Payment Deferral [Member] |  |  |  |
Accruing TDRs | 8,985 | 17,912 |  |
Contractual Interest Rate Reduction [Member] |  |  |  |
Accruing TDRs | 0 | 0 |  |
Rate Reduction and Payment Deferral [Member] |  |  |  |
Accruing TDRs | 0 | 136 |  |
Commercial Portfolio Segment [Member] |  |  |  |
Accruing TDRs | 8,462 | 16,692 |  |
Commercial Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |
Accruing TDRs | 8,462 | 16,692 |  |
Commercial Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |
Accruing TDRs | 0 | 0 |  |
Commercial Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |
Accruing TDRs | 0 | 0 |  |
Residential Portfolio Segment [Member] |  |  |  |
Accruing TDRs | 523 |  |  |
Residential Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |
Accruing TDRs | 523 |  |  |
Residential Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |
Accruing TDRs | 0 |  |  |
Residential Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |
Accruing TDRs | $ 0 |  |  |
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |
Accruing TDRs |  | 1,356 |  |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |
Accruing TDRs |  | 1,220 |  |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |
Accruing TDRs |  | 0 |  |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |
Accruing TDRs |  | $ 136 |  |

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- Definition Amount of financing receivable modified as troubled debt restructuring. + 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=121611835&loc=SL6953676-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
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