Note 3 - Loans and Allowance for Credit Losses on Loans - Loans by Loan Portfolio Class (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Loans	[1]	$ 5,849,715	$ 5,771,038
Home Equity Line of Credit [Member]
Loans		212,443	211,390
Credit Card Receivable [Member]
Loans		24,104	23,632
Commercial Real Estate Portfolio Segment [Member]
Loans		2,541,456	2,469,113
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Loans		1,609,483	1,561,689
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Loans		931,973	907,424
Commercial and Industrial Portfolio Segment [Member]
Loans		864,272	867,380
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member]
Loans		429,424	439,748
Total Commercial and Industrial Portfolio Segment [Member]
Loans		1,293,696	1,307,128
Residential Real Estate Portfolio Segment [Member]
Loans		1,084,192	1,067,608
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Loans		360,958	358,715
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Loans		723,234	708,893
Construction and Development [Member]
Loans		532,183	531,324
Consumer Portfolio Segment [Member]
Loans		145,022	145,340
Finance Leases Portfolio Segment [Member]
Loans		$ 16,619	$ 15,503

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