Note 5 - Loans and ACL for Loans - Credit Card Loan Payment Activity (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Loans	[1]	$ 5,771,038	$ 5,205,918
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member]
Loans		23,632	20,413
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Performing Financial Instruments [Member]
Loans		23,512	20,413
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Nonperforming Financial Instruments [Member]
Loans		$ 120	$ 0

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