Note 3 - Loans and Allowance for Credit Losses on Loans - Loans by Loan Portfolio Class (Details) - USD ($) $ in Thousands		Jun. 30, 2023	Dec. 31, 2022
Loans	[1]	$ 5,418,609	$ 5,205,918
Home Equity Line of Credit [Member]
Loans		202,574	200,725
Credit Card Receivable [Member]
Loans		22,190	20,413
Commercial Real Estate Portfolio Segment [Member]
Loans		2,351,713	2,231,975
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Loans		1,477,733	1,397,346
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Loans		873,980	834,629
Commercial and Industrial Portfolio Segment [Member] | Term, Excluding PPP [Member]
Loans		788,070	765,163
Commercial and Industrial Portfolio Segment [Member] | Term [Member]
Loans		788,070
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member]
Loans		7,088	18,593
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member]
Loans		438,484	465,813
Total Commercial and Industrial Portfolio Segment [Member]
Loans		1,233,642	1,249,569
Residential Real Estate Portfolio Segment [Member]
Loans		1,003,597	904,763
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Loans		338,727	313,248
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Loans		664,870	591,515
Construction and Development [Member]
Loans		451,324	445,690
Consumer Portfolio Segment [Member]
Loans		139,602	139,461
Finance Leases Portfolio Segment [Member]
Loans		$ 13,967	$ 13,322

[1] Total loans are presented inclusive of premiums, discounts and net loan origination fees and costs.