Note 3 - Loans and Allowance for Loan Losses - Concentrations Within the Loan Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, before Allowance for Credit Loss, Total	$ 4,303,758	$ 3,916,619
Commercial Real Estate Loans to Lessors of Non Residential Buildings [Member]
Financing Receivable, before Allowance for Credit Loss, Total	$ 754,611	$ 738,891
Percent of portfolio	17.50%	18.90%

Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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+ Details