Note 19 - Commitments and Contingent Liabilities - Off Balance Sheet Commitments to Extend Credit (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Off balance sheet commitments to extend credit	$ 1,172,933	$ 834,604
Commercial and Industrial Loans [Member]
Off balance sheet commitments to extend credit	416,195	309,920
Construction and Development [Member]
Off balance sheet commitments to extend credit	240,503	179,364
Home Equity Loans [Member]
Off balance sheet commitments to extend credit	155,920	147,907
Credit Cards [Member]
Off balance sheet commitments to extend credit	26,439	20,003
Overdrafts [Member]
Off balance sheet commitments to extend credit	32,715	21,751
Letters of Credit [Member]
Off balance sheet commitments to extend credit	24,193	20,891
Other Off Balance Sheet Commitments [Member]
Off balance sheet commitments to extend credit	40,083	33,369
Future Loan Commitments [Member]
Off balance sheet commitments to extend credit	$ 236,885	$ 101,399