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Note 17 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Equity securities |  | $ 40,406 | $ 22,158
Warrants |  | 54,268 | 90,451
Fair Value, Inputs, Level 1 [Member] |  |  |
Equity securities |  | 40,406 | 22,158
Fair Value, Inputs, Level 2 [Member] |  |  |
Equity securities |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |  |
Equity securities |  | 0 | 0
Estimate of Fair Value Measurement [Member] |  |  |
Cash and due from banks |  | 173,988 | 195,440
Short-term investments |  | 654,813 | 966,962
Loans, net | [1] | 19,605,152 | 17,944,588
Equity securities |  | 40,406 | 22,158
Investment in Federal Home Loan Bank stock |  | 17,746 | 17,250
Deposits |  | 19,347,070 | 18,572,387
Advances from Federal Home Loan Bank |  | 536,996 | 482,737
Other borrowings |  | 13,978 | 18,385
Long-term debt |  | 72,304 | 68,231
Estimate of Fair Value Measurement [Member] | Warrants [Member] |  |  |
Warrants |  | 0 | 50
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and due from banks |  | 173,988 | 195,440
Short-term investments |  | 654,813 | 966,962
Loans, net | [1] | 0 | 0
Equity securities |  | 40,406 | 22,158
Investment in Federal Home Loan Bank stock |  | 0 | 0
Deposits |  | 0 | 0
Advances from Federal Home Loan Bank |  | 0 | 0
Other borrowings |  | 0 | 0
Long-term debt |  | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Warrants [Member] |  |  |
Warrants |  | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Cash and due from banks |  | 0 | 0
Short-term investments |  | 0 | 0
Loans, net | [1] | 0 | 0
Equity securities |  | 0 | 0
Investment in Federal Home Loan Bank stock |  | 17,746 | 17,250
Deposits |  | 0 | 0
Advances from Federal Home Loan Bank |  | 536,996 | 482,737
Other borrowings |  | 0 | 0
Long-term debt |  | 72,304 | 68,231
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Warrants [Member] |  |  |
Warrants |  | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Cash and due from banks |  | 0 | 0
Short-term investments |  | 0 | 0
Loans, net | [1] | 19,605,152 | 17,944,588
Equity securities |  | 0 | 0
Investment in Federal Home Loan Bank stock |  | 0 | 0
Deposits |  | 19,347,070 | 18,572,387
Advances from Federal Home Loan Bank |  | 0 | 0
Other borrowings |  | 13,978 | 18,385
Long-term debt |  | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Warrants [Member] |  |  |
Warrants |  | $ 0 | $ 50
[1] | In accordance with the prospective adoption of ASU 2016-01, the fair value of loans as of December 31, 2019 & 2018 was measured using an exit price notion.

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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