Note 3 - Loans - Loans by Loan Portfolio Class (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Loans	$ 2,272,778	$ 2,305,375
Commercial and Industrial Portfolio Segment [Member]
Loans	736,633	736,841
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member]
Loans	165,832	192,348
Undevelopment Land Portfolio Segment [Member]
Loans	21,207	21,496
Real Estate Mortgage Portfolio Segment [Member]
Loans	1,314,397	1,319,520
Real Estate Mortgage Portfolio Segment [Member] | Commercial Investment [Member]
Loans	546,957	538,886
Real Estate Mortgage Portfolio Segment [Member] | Owner Occupied Commercial [Member]
Loans	406,209	408,292
Real Estate Mortgage Portfolio Segment [Member] | One to Four Family Residential [Member]
Loans	244,349	249,498
Real Estate Mortgage Portfolio Segment [Member] | Home Equity First Lien [Member]
Loans	51,076	55,325
Real Estate Mortgage Portfolio Segment [Member] | Home Equity Junior Lien [Member]
Loans	65,806	67,519
Consumer Portfolio Segment [Member]
Loans	$ 34,709	$ 35,170