Note 4 - Loans and Allowance for Credit Losses on Loans - Loans by Loan Portfolio Class (Details) - USD ($) $ in Thousands		Mar. 31, 2023	Dec. 31, 2022
Loans	[1]	$ 5,243,104	$ 5,205,918
Home Equity Line of Credit [Member]
Loans		200,933	200,725
Credit Card Receivable [Member]
Loans		21,738	20,413
Commercial Real Estate Portfolio Segment [Member]
Loans		2,272,426	2,231,975
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Loans		1,421,660	1,397,346
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Loans		850,766	834,629
Commercial and Industrial Portfolio Segment [Member] | Term, Excluding PPP [Member]
Loans		769,479	765,163
Commercial and Industrial Portfolio Segment [Member] | Term [Member]
Loans		769,479
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member]
Loans		9,557	18,593
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member]
Loans		435,743	465,813
Total Commercial and Industrial Portfolio Segment [Member]
Loans		1,214,779	1,249,569
Residential Real Estate Portfolio Segment [Member]
Loans		943,936	904,763
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Loans		323,519	313,248
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Loans		620,417	591,515
Construction and Development [Member]
Loans		439,673	445,690
Consumer Portfolio Segment [Member]
Loans		136,412	139,461
Finance Leases Portfolio Segment [Member]
Loans		$ 13,207	$ 13,322

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