Note 4 - Loans and Allowance for Credit Losses on Loans - Credit Card Loan Payment Activity (Details) - USD ($) $ in Thousands		Jun. 30, 2022	Dec. 31, 2021
Loans	[1]	$ 4,877,324	$ 4,169,303
Credit Card Receivable [Member]
Loans		21,647	17,087
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member]
Loans		21,647	17,087
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Performing Financial Instruments [Member]
Loans		21,647	17,087
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Nonperforming Financial Instruments [Member]
Loans		$ 0	$ 0

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