Note 4 - Loans/Leases Receivable - Loans by Internally Assigned Risk Rating (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans and leases	$ 3,681,346	$ 3,723,630
Commercial Portfolio Segment [Member]
Loans and leases	1,507,825	1,429,410
Commercial Portfolio Segment [Member] | Internally Assigned Risk Rating [Member]
Loans and leases	1,365,847	1,326,006
Commercial Portfolio Segment [Member] | Pass [Member]
Loans and leases	1,334,446	1,294,418
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans and leases	12,962	23,302
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans and leases	18,439	8,286
Commercial Real Estate Portfolio Segment [Member]
Loans and leases	1,736,396	1,766,111
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	443,989	500,654
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans and leases	378,797	236,787
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	913,610	1,028,670
Commercial Real Estate Portfolio Segment [Member] | Internally Assigned Risk Rating [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	443,989	500,654
Commercial Real Estate Portfolio Segment [Member] | Internally Assigned Risk Rating [Member] | Construction Loans [Member]
Loans and leases	378,797	236,787
Commercial Real Estate Portfolio Segment [Member] | Internally Assigned Risk Rating [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	913,610	1,028,670
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	439,418	487,949
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Construction Loans [Member]
Loans and leases	378,572	230,473
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	896,206	1,008,626
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	3,044	9,599
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Construction Loans [Member]
Loans and leases	41	3,848
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	3,905	5,309
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	1,527	3,106
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Construction Loans [Member]
Loans and leases	184	2,466
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	13,499	14,735
Commercial and Commercial Real Estate Portfolio Segments [Member] | Internally Assigned Risk Rating [Member]
Loans and leases	$ 3,102,243	$ 3,092,117
As a % of Total	100.00%	100.00%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Pass [Member]
Loans and leases	$ 3,048,642	$ 3,021,466
As a % of Total	98.28%	97.72%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Special Mention [Member]
Loans and leases	$ 19,952	$ 42,058
As a % of Total	0.64%	1.36%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Substandard [Member]
Loans and leases	$ 33,649	$ 28,593
As a % of Total	1.08%	0.92%