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Note 8 - Loans - Accruing Troubled Debt Restructurings (Details) - Accruing Troubled Debt Restructuring [Member] - USD ($) $ in Thousands | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Accruing TDRs | $ 31,671 | $ 34,364 | $ 35,336 | $ 64,898 | $ 62,948 | $ 65,071
Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 5,127 |  | 8,355 |  |  |
Contractual Interest Rate Reduction [Member] |  |  |  |  |  |
Accruing TDRs | 5,988 |  | 6,059 |  |  |
Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 20,556 |  | 20,922 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Accruing TDRs | 2,129 |  | 5,215 |  |  |
Commercial Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 2,129 |  | 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 | 24,733 |  | 25,142 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 585 |  | 615 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |  |  |
Accruing TDRs | 5,689 |  | 5,748 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 18,459 |  | 18,779 |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Accruing TDRs | 4,809 |  | 4,979 |  |  |
Residential Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 2,413 |  | 2,525 |  |  |
Residential Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |  |  |
Accruing TDRs | 299 |  | 311 |  |  |
Residential Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | $ 2,097 |  | $ 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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