Note 4 - Loans and Leases - Loans by Loan Portfolio Class (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Loans and leases	[1]	$ 2,763,880	$ 2,548,171
Commercial and Industrial Portfolio Segment [Member]
Loans and leases		860,085	833,524
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member]
Loans and leases	[2]	222,632	225,050
Undevelopment Land Portfolio Segment [Member]
Loans and leases		35,169	30,092
Real Estate Mortgage Portfolio Segment [Member]
Loans and leases		1,602,057	1,411,447
Real Estate Mortgage Portfolio Segment [Member] | Commercial Investment [Member]
Loans and leases		696,421	588,610
Real Estate Mortgage Portfolio Segment [Member] | Owner Occupied Commercial [Member]
Loans and leases		452,719	426,373
Real Estate Mortgage Portfolio Segment [Member] | One to Four Family Residential [Member]
Loans and leases		338,957	276,017
Real Estate Mortgage Portfolio Segment [Member] | Home Equity First Lien [Member]
Loans and leases		46,012	49,500
Real Estate Mortgage Portfolio Segment [Member] | Home Equity Junior Lien [Member]
Loans and leases		67,948	70,947
Consumer Portfolio Segment [Member]
Loans and leases		$ 43,937	$ 48,058

[1] Total loans are presented inclusive of premiums, discounts, and net loan origination fees and costs.

[2] Consists of land acquired for development by the borrower, but for which no development has yet taken place.