Note 12 - Commitments and Contingent Liabilities - Off Balance Sheet Commitments to Extend Credit (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Off balance sheet commitments to extend credit	$ 2,538,097	$ 2,456,664
Commercial and Industrial Loans [Member]
Off balance sheet commitments to extend credit	927,870	897,673
Construction and Development [Member]
Off balance sheet commitments to extend credit	634,705	606,668
Home Equity Loans [Member]
Off balance sheet commitments to extend credit	387,244	381,110
Credit Cards [Member]
Off balance sheet commitments to extend credit	84,209	83,700
Overdrafts [Member]
Off balance sheet commitments to extend credit	55,926	55,124
Letters of Credit [Member]
Off balance sheet commitments to extend credit	35,627	33,778
Other Off Balance Sheet Commitments [Member]
Off balance sheet commitments to extend credit	87,732	100,447
Future Loan Commitments [Member]
Off balance sheet commitments to extend credit	$ 324,784	$ 298,164