Note 4 - Loans/Leases Receivable - Loans by Internally Assigned Risk Rating (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans and leases	$ 4,243,791	$ 3,681,346
Commercial Portfolio Segment [Member]
Loans and leases	1,726,723	1,507,825
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Loans and leases	541,455	378,797
Commercial Portfolio Segment [Member] | Internally Assigned Risk Rating [Member]
Loans and leases	1,555,217	1,365,847
Commercial Portfolio Segment [Member] | Pass [Member]
Loans and leases	1,506,578	1,334,446
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans and leases	23,929	12,962
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans and leases	24,710	18,439
Commercial Real Estate Portfolio Segment [Member]
Loans and leases	2,107,629	1,736,396
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	496,471	443,989
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans and leases	541,455	378,797
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	1,069,703	913,610
Commercial Real Estate Portfolio Segment [Member] | Internally Assigned Risk Rating [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	496,471	443,989
Commercial Real Estate Portfolio Segment [Member] | Internally Assigned Risk Rating [Member] | Construction Loans [Member]
Loans and leases	541,455	378,797
Commercial Real Estate Portfolio Segment [Member] | Internally Assigned Risk Rating [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	1,069,703	913,610
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	488,478	439,418
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Construction Loans [Member]
Loans and leases	530,297	378,572
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	999,931	896,206
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	3,087	3,044
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Construction Loans [Member]
Loans and leases	680	41
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	43,785	3,905
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	4,906	1,527
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Construction Loans [Member]
Loans and leases	10,478	184
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans and leases	25,987	13,499
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%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Pass [Member]
Loans and leases	$ 3,525,284	$ 3,048,642
As a % of Total	96.00%	98.28%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Special Mention [Member]
Loans and leases	$ 71,481	$ 19,952
As a % of Total	1.95%	0.64%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Substandard [Member]
Loans and leases	$ 66,081	$ 33,649
As a % of Total	1.80%	1.08%