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Note 10 - Borrowed Funds (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Securities Sold under Agreements to Repurchase	$ 125,000	$ 0
Advance from Federal Home Loan Bank	190,000	60,000
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds	7,500,000	7,470,000
Junior Subordinated Notes, Noncurrent	$ 119,100	$ 119,100
Junior Subordinated Debt [Member]
Debt Instrument, Interest Rate, Effective Percentage	6.84%	7.75%
Debt Instrument, Term (Year)	30 years
Asset Not Pledged as Collateral [Member] | Federal Home Loan Bank Securities [Member]
Debt Securities, Available-for-Sale	$ 1,620	$ 1,530,000
Non Overnight Borrowings [Member]
Advance from Federal Home Loan Bank	$ 190,000	$ 60,000
Federal Home Loan Bank, Advance, Branch of FHLBank, Interest Rate	4.45%	5.08%
Mature in April 2025 [Member]
Advance from Federal Home Loan Bank	$ 190,000

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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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