Note 5 - Loans (Details) - Loans by Loan Portfolio Class - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 2,033,007	$ 1,868,550	$ 1,721,350
Commercial and Industrial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	644,398	571,754	510,739
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	134,482	95,733
Undevelopment Land Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	21,185	21,268	29,871
Real Estate Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,197,411	1,150,399	1,046,823
Real Estate Mortgage Portfolio Segment [Member] | Commercial Investment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	482,639	487,822
Real Estate Mortgage Portfolio Segment [Member] | Owner Occupied Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	375,016	340,982
Real Estate Mortgage Portfolio Segment [Member] | One to Four Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	226,575	211,548
Real Estate Mortgage Portfolio Segment [Member] | Home Equity First Lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	50,115	43,779
Real Estate Mortgage Portfolio Segment [Member] | Home Equity Junior Lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	63,066	66,268
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 35,531	$ 29,396	$ 34,198