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Note 16 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - Estimate of Fair Value Measurement [Member] - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Cash and due from banks	$ 157,167	$ 173,988
Short-term investments	882,353	654,813
Loans, net	19,500,647	19,605,152
Equity securities	1,539	40,406
Investment in Federal Home Loan Bank stock	17,250	17,746
Deposits	19,670,327	19,347,070
Advances from Federal Home Loan Bank	59,606	536,996
Other borrowings	15,281	13,978
Long-term debt	73,752	72,304
Fair Value, Inputs, Level 1 [Member]
Cash and due from banks	157,167	173,988
Short-term investments	882,353	654,813
Loans, net	0	0
Equity securities	0	40,406
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
Fair Value, Inputs, Level 2 [Member]
Cash and due from banks	0	0
Short-term investments	0	0
Loans, net	0	0
Equity securities	0	0
Investment in Federal Home Loan Bank stock	17,250	17,746
Deposits	0	0
Advances from Federal Home Loan Bank	59,606	536,996
Other borrowings	0	0
Long-term debt	73,752	72,304
Fair Value, Inputs, Level 3 [Member]
Cash and due from banks	0	0
Short-term investments	0	0
Loans, net	19,500,647	19,605,152
Equity securities	1,539	0
Investment in Federal Home Loan Bank stock	0	0
Deposits	19,670,327	19,347,070
Advances from Federal Home Loan Bank	0	0
Other borrowings	15,281	13,978
Long-term debt	$ 0	$ 0

X

- Definition

Fair value portion of other borrowings.

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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.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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