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Note 5 - Loans and the Allowance for Credit Losses - Composition of Loan Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Gross loans	$ 8,156,217	$ 8,109,161
Net deferred loan fees	(7,677)	(9,472)
Total loans receivable	8,148,540	8,099,689
Commercial Portfolio Segment [Member]
Gross loans	1,472,795	1,472,734
Commercial Real Estate Portfolio Segment [Member]
Gross loans	5,831,382	5,795,228
Commercial Construction Portfolio Segment [Member]
Gross loans	596,219	574,139
Residential Portfolio Segment [Member]
Gross loans	254,405	264,748
Consumer Portfolio Segment [Member]
Gross loans	$ 1,416	$ 2,312

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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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