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Note 6 - Loans and the Allowance for Credit Losses - Composition of Loan Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Gross loans	$ 8,116,332	$ 8,351,841
Net deferred loan fees	(4,356)	(6,696)
Total loans receivable	8,111,976	8,345,145
Commercial Portfolio Segment [Member]
Gross loans	1,513,991	1,578,730
Commercial Real Estate Portfolio Segment [Member]
Gross loans	5,735,170	5,895,545
Commercial Construction Portfolio Segment [Member]
Gross loans	616,087	620,496
Residential Portfolio Segment [Member]
Gross loans	250,249	256,041
Consumer Portfolio Segment [Member]
Gross loans	$ 835	$ 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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