Note 4 - Loans and Allowance for Credit Losses on Loans - Credit Card Loan Payment Activity (Details) - USD ($) $ in Thousands		Jun. 30, 2021	Dec. 31, 2020
Loans	[1],[2]	$ 4,206,392	$ 3,531,596
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member]
Loans		14,960	10,203
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Performing Financial Instruments [Member]
Loans		14,960	10,203
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Nonperforming Financial Instruments [Member]
Loans		$ 0	$ 0

[1] Pursuant to the CARES Act, loan deferrals granted to borrowers experiencing business interruptions related to the pandemic were not classified as TDRs and not included in past due and/or non-performing loan statistics. As of June 30, 2021 and December 31, 2020, outstanding CARES Act loan deferrals of $8 million and $37 million are reflected as current, respectively.

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