Note 5 - Loans and the Allowance for Credit Losses - Collateral Dependent Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021
Loans and Leases Receivable, Gross		$ 7,910,013	$ 6,838,351
Real Estate [Member]
Loans and Leases Receivable, Gross		83,525	83,681
Other Collateral Pledged [Member]
Loans and Leases Receivable, Gross		23,449	26,182
Collateral Pledged [Member]
Loans and Leases Receivable, Gross		106,974	109,863
Commercial Portfolio Segment [Member]
Loans and Leases Receivable, Gross	[1]	1,448,727	1,299,428
Commercial Portfolio Segment [Member] | Real Estate [Member]
Loans and Leases Receivable, Gross		5,446	6,385
Commercial Portfolio Segment [Member] | Other Collateral Pledged [Member]
Loans and Leases Receivable, Gross		23,449	26,182
Commercial Portfolio Segment [Member] | Collateral Pledged [Member]
Loans and Leases Receivable, Gross		28,895	32,567
Commercial Real Estate Portfolio Segment [Member]
Loans and Leases Receivable, Gross		5,666,848	4,741,590
Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans and Leases Receivable, Gross		64,718	55,244
Commercial Real Estate Portfolio Segment [Member] | Other Collateral Pledged [Member]
Loans and Leases Receivable, Gross		0	0
Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member]
Loans and Leases Receivable, Gross		64,718	55,244
Commercial Construction Portfolio Segment [Member]
Loans and Leases Receivable, Gross		537,323	540,178
Commercial Construction Portfolio Segment [Member] | Real Estate [Member]
Loans and Leases Receivable, Gross		7,727	13,196
Commercial Construction Portfolio Segment [Member] | Other Collateral Pledged [Member]
Loans and Leases Receivable, Gross		0	0
Commercial Construction Portfolio Segment [Member] | Collateral Pledged [Member]
Loans and Leases Receivable, Gross		7,727	13,196
Residential Portfolio Segment [Member]
Loans and Leases Receivable, Gross		256,085	255,269
Residential Portfolio Segment [Member] | Real Estate [Member]
Loans and Leases Receivable, Gross		5,634	8,856
Residential Portfolio Segment [Member] | Other Collateral Pledged [Member]
Loans and Leases Receivable, Gross		0	0
Residential Portfolio Segment [Member] | Collateral Pledged [Member]
Loans and Leases Receivable, Gross		5,634	8,856
Consumer Portfolio Segment [Member]
Loans and Leases Receivable, Gross		1,030	1,886
Consumer Portfolio Segment [Member] | Real Estate [Member]
Loans and Leases Receivable, Gross		0	0
Consumer Portfolio Segment [Member] | Other Collateral Pledged [Member]
Loans and Leases Receivable, Gross		0	0
Consumer Portfolio Segment [Member] | Collateral Pledged [Member]
Loans and Leases Receivable, Gross		$ 0	$ 0

[1] Includes PPP loans of $11.5 million and $93.1 million as of September 30, 2022 and December 31, 2021 , respectively.