Note 3 - Loans (Details) - Loans by Loan Portfolio Class - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,954,425	$ 1,868,550
Commercial and Industrial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	610,877	571,754
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	109,870	95,733
Undevelopment Land Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	18,950	21,268
Real Estate Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,183,602	1,150,399
Real Estate Mortgage Portfolio Segment [Member] | Commercial Investment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	491,171	487,822
Real Estate Mortgage Portfolio Segment [Member] | Owner Occupied Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	357,628	340,982
Real Estate Mortgage Portfolio Segment [Member] | One to Four Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	222,643	211,548
Real Estate Mortgage Portfolio Segment [Member] | Home Equity First Lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	49,937	43,779
Real Estate Mortgage Portfolio Segment [Member] | Home Equity Junior Lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	62,223	66,268
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 31,126	$ 29,396