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Note 5 - Loans and the Allowance for Credit Losses - Composition of Loan Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Gross loans	$ 8,280,482	$ 8,351,841
Net deferred fees	(5,672)	(6,696)
Loans receivable	8,274,810	8,345,145
Commercial Portfolio Segment [Member]
Gross loans	1,532,730	1,578,730
Commercial Real Estate Portfolio Segment [Member]
Gross loans	5,880,679	5,895,545
Commercial Construction Portfolio Segment [Member]
Gross loans	616,246	620,496
Residential Portfolio Segment [Member]
Gross loans	249,691	256,041
Consumer Portfolio Segment [Member]
Gross loans	$ 1,136	$ 1,029

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

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