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Note 6 - Loans and the Allowance for Credit Losses - Composition of Loan Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Gross loans	$ 8,206,343	$ 8,280,482
Net deferred loan fees	(5,209)	(5,672)
Total loans receivable	8,201,134	8,274,810
Commercial Portfolio Segment [Member]
Gross loans	1,492,920	1,532,730
Commercial Real Estate Portfolio Segment [Member]
Gross loans	5,837,671	5,880,679
Commercial Construction Portfolio Segment [Member]
Gross loans	617,593	616,246
Residential Portfolio Segment [Member]
Gross loans	256,555	249,691
Consumer Portfolio Segment [Member]
Gross loans	$ 1,604	$ 1,136

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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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