Note 12 - Commitments and Contingent Liabilities - Off Balance Sheet Commitments to Extend Credit (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Off balance sheet commitments to extend credit	$ 2,371,734	$ 2,438,242
Commercial and Industrial Loans [Member]
Off balance sheet commitments to extend credit	873,629	876,503
Construction and Development [Member]
Off balance sheet commitments to extend credit	566,606	566,045
Home Equity Loans [Member]
Off balance sheet commitments to extend credit	420,138	403,461
Credit Cards [Member]
Off balance sheet commitments to extend credit	91,592	92,060
Overdrafts [Member]
Off balance sheet commitments to extend credit	57,553	58,078
Letters of Credit [Member]
Off balance sheet commitments to extend credit	30,041	30,472
Other Off Balance Sheet Commitments [Member]
Off balance sheet commitments to extend credit	86,491	86,010
Future Loan Commitments [Member]
Off balance sheet commitments to extend credit	$ 245,684	$ 325,613