Note 12 - Commitments and Contingent Liabilities - Off Balance Sheet Commitments to Extend Credit (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Off balance sheet commitments to extend credit	$ 2,295,306	$ 2,063,587
Commercial and Industrial Loans [Member]
Off balance sheet commitments to extend credit	867,447	784,429
Construction and Development [Member]
Off balance sheet commitments to extend credit	510,785	449,028
Home Equity Loans [Member]
Off balance sheet commitments to extend credit	371,567	358,610
Credit Cards [Member]
Off balance sheet commitments to extend credit	69,850	64,231
Overdrafts [Member]
Off balance sheet commitments to extend credit	55,343	57,193
Letters of Credit [Member]
Off balance sheet commitments to extend credit	33,675	34,704
Other Off Balance Sheet Commitments [Member]
Off balance sheet commitments to extend credit	94,054	93,419
Future Loan Commitments [Member]
Off balance sheet commitments to extend credit	$ 292,585	$ 221,973