Note 4 - Loans/Leases Receivable - Leases By Delinquency Status (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans and leases	$ 4,243,791	$ 3,681,346
Nonperforming Financial Instruments [Member]
Loans and leases	14,684	8,914
Commercial Portfolio Segment [Member]
Loans and leases	1,726,723	1,507,825
Commercial Portfolio Segment [Member] | Internally Assigned Risk Rating [Member]
Loans and leases	1,555,217	1,365,847
Commercial Portfolio Segment [Member] | Delinquency Status [Member]
Loans and leases	171,506	141,978
Commercial Portfolio Segment [Member] | Performing Less Than Ninety Days Past Due [Member}
Loans and leases	170,712	140,992
Commercial Portfolio Segment [Member] | Non Performing Greater Than Ninety Days Past Due [Member]
Loans and leases	794	986
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans and leases	5,413	1,882
Direct financing leases
Loans and leases	66,016	87,869
Direct financing leases | Delinquency Status [Member]
Loans and leases	66,016	87,869
Direct financing leases | Performing Less Than Ninety Days Past Due [Member}
Loans and leases	65,475	86,019
Direct financing leases | Non Performing Greater Than Ninety Days Past Due [Member]
Loans and leases	541	1,850
Direct financing leases | Nonperforming Financial Instruments [Member]
Loans and leases	541	1,850
Residential Portfolio Segment [Member]
Loans and leases	252,121	239,904
Residential Portfolio Segment [Member] | Delinquency Status [Member]
Loans and leases	252,121	239,904
Residential Portfolio Segment [Member] | Performing Less Than Ninety Days Past Due [Member}
Loans and leases	251,099	239,198
Residential Portfolio Segment [Member] | Non Performing Greater Than Ninety Days Past Due [Member]
Loans and leases	1,022	706
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans and leases	1,022	706
Consumer Portfolio Segment [Member]
Loans and leases	91,302	109,352
Consumer Portfolio Segment [Member] | Delinquency Status [Member]
Loans and leases	91,302	109,352
Consumer Portfolio Segment [Member] | Performing Less Than Ninety Days Past Due [Member}
Loans and leases	91,094	108,763
Consumer Portfolio Segment [Member] | Non Performing Greater Than Ninety Days Past Due [Member]
Loans and leases	208	589
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans and leases	208	589
Commercial and Commercial Real Estate Portfolio Segments [Member] | Internally Assigned Risk Rating [Member]
Loans and leases	$ 3,662,846	$ 3,102,243
As a % of Total	100.00%	100.00%
Lease Residential and Consumer Portfolio Segments [Member] | Delinquency Status [Member]
Loans and leases	$ 580,945	$ 579,103
As a % of Total	100.00%	100.00%
Lease Residential and Consumer Portfolio Segments [Member] | Performing Less Than Ninety Days Past Due [Member}
Loans and leases	$ 578,380	$ 574,972
As a % of Total	99.56%	99.29%
Lease Residential and Consumer Portfolio Segments [Member] | Non Performing Greater Than Ninety Days Past Due [Member]
Loans and leases	$ 2,565	$ 4,131
As a % of Total	0.44%	0.71%