Note 13 - Commitments and Contingent Liabilities - Off Balance Sheet Commitments to Extend Credit (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Off balance sheet commitments to extend credit	$ 2,074,090	$ 2,063,587
Commercial and Industrial Loans [Member]
Off balance sheet commitments to extend credit	789,390	784,429
Construction and Development [Member]
Off balance sheet commitments to extend credit	453,430	449,028
Home Equity Loans [Member]
Off balance sheet commitments to extend credit	367,949	358,610
Credit Cards [Member]
Off balance sheet commitments to extend credit	68,519	64,231
Overdrafts [Member]
Off balance sheet commitments to extend credit	58,022	57,193
Letters of Credit [Member]
Off balance sheet commitments to extend credit	34,273	34,704
Other Off Balance Sheet Commitments [Member]
Off balance sheet commitments to extend credit	101,103	93,419
Future Loan Commitments [Member]
Off balance sheet commitments to extend credit	$ 201,404	$ 221,973