Note 12 - Commitments and Contingent Liabilities - Off Balance Sheet Commitments to Extend Credit (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Off balance sheet commitments to extend credit	$ 2,414,042	$ 2,456,664
Commercial and Industrial Loans [Member]
Off balance sheet commitments to extend credit	887,664	897,673
Construction and Development [Member]
Off balance sheet commitments to extend credit	614,099	606,668
Home Equity Loans [Member]
Off balance sheet commitments to extend credit	403,649	381,110
Credit Cards [Member]
Off balance sheet commitments to extend credit	90,061	83,700
Overdrafts [Member]
Off balance sheet commitments to extend credit	57,177	55,124
Letters of Credit [Member]
Off balance sheet commitments to extend credit	34,720	33,778
Other Off Balance Sheet Commitments [Member]
Off balance sheet commitments to extend credit	88,046	100,447
Future Loan Commitments [Member]
Off balance sheet commitments to extend credit	$ 238,626	$ 298,164