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Note 4 - Loans - Accruing Troubled Debt Restructurings (Details) - Accruing Troubled Debt Restructuring [Member] - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Accruing TDRs | $ 27,721 | $ 35,336 | $ 65,071 | $ 68,565
Payment Deferral [Member] |  |  |  |
Accruing TDRs | 6,222 | 8,355 |  |
Contractual Interest Rate Reduction [Member] |  |  |  |
Accruing TDRs | 5,910 | 6,059 |  |
Rate Reduction and Payment Deferral [Member] |  |  |  |
Accruing TDRs | 15,589 | 20,922 |  |
Commercial Portfolio Segment [Member] |  |  |  |
Accruing TDRs | 3,983 | 5,215 |  |
Commercial Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |
Accruing TDRs | 3,983 | 5,215 |  |
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 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Accruing TDRs | 19,575 | 25,142 |  |
Commercial Real Estate Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |
Accruing TDRs | 515 | 615 |  |
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |
Accruing TDRs | 5,635 | 5,748 |  |
Commercial Real Estate Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |
Accruing TDRs | 13,425 | 18,779 |  |
Residential Portfolio Segment [Member] |  |  |  |
Accruing TDRs | 4,163 | 4,979 |  |
Residential Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |
Accruing TDRs | 1,724 | 2,525 |  |
Residential Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |
Accruing TDRs | 275 | 311 |  |
Residential Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |
Accruing TDRs | $ 2,164 | $ 2,143 |  |

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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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