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Note 15 - Financial Derivatives - Fair Value Swap Hedges (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Net unrealized loss |  |  |  | $ 2,194 | $ (3,981) |
Periodic net settlement of SWAPs | [1] | $ (2,363) | $ (2,510) | (7,137) | $ (5,307) |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |  |  |  |
Derivative, Notional Amount |  | $ 779,392 |  | $ 779,392 |  | $ 478,266
Weighted average fixed rate-pay |  | 2.48% |  | 2.48% |  | 4.56%
Weighted average variable rate-receive |  | 1.31% |  | 1.31% |  | 3.11%
Net unrealized loss | [2] |  |  | $ (8,255) |  | $ (15,082)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Weighted average variable rate spread |  | 1.22% |  | 1.22% |  | 2.46%
[1] | the amount of periodic net settlement of interest rate swaps was included in interest income.
[2] | the amount is included in other non-interest income.

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
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