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Note 14 - Financial Derivatives (Details Textual) - USD ($) $ in Thousands |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 31, 2014 | Jun. 30, 2024 | Dec. 31, 2022 | Dec. 31, 2023
Junior Subordinated Notes, Total | $ 119,100 |  |  |
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivative Outstanding, Notional Amount | $ 119,100 | $ 618,400 |  | $ 650,900
Derivative, Notional Amount |  | 40,000 |  | 38,600
Derivative Original Maturity (Year) | 10 years |  |  |
Deferred Gain on Early Termination of Derivative |  |  | $ 4,000 |
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Central Counterparties (CCP) [Member] |  |  |  |
Derivative, Notional Amount |  | 0 |  | 0
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivative, Notional Amount |  | 837,155 |  | $ 1,156,007
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Central Counterparties (CCP) [Member] |  |  |  |
Derivative, Notional Amount |  | 533,600 |  |
Derivative, Gain on Derivative |  | 3,600 |  |
Interest Rate Contract [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivative Outstanding, Notional Amount |  | 82,800 |  |
Derivative, Notional Amount |  | $ 4,500 |  |
Interest Rate Contract [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Minimum [Member] |  |  |  |
Derivative, Term of Contract (Year) |  | 3 years |  |
Interest Rate Contract [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Maximum [Member] |  |  |  |
Derivative, Term of Contract (Year) |  | 10 years |  |
Loans Receivable with Partial-term Hedging Designation [Member] |  |  |  |
Derivative, Notional Amount |  | $ 7,100 |  |
Hedged Asset, Fair Value Hedge |  | 754,400 |  |
Loan, Notational Amount |  | 1,250,000 |  |
Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Fair Value, Cumulative Increase (Decrease) |  | $ (5,800) |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References No definition available. + Details
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- Definition Outstanding notional amount specified by the derivative(s). Expressed as an absolute value. + References No definition available. + Details
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- Definition Amount of increase in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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