Note 3 - Loans - Loans by Class (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Non-covered loans	$ 1,776,112	$ 1,789,236	[1]
Non-covered loans, percent	98.73%	98.46%
Covered loans	$ 22,919	$ 27,948
Covered loans, percent	1.27%	1.54%
Total loans held for investment, net of unearned income	$ 1,799,031	$ 1,817,184
Total loans held for investment, net of unearned income, percent	100.00%	100.00%
Commercial Portfolio Segment [Member]
Non-covered loans	$ 1,062,692	$ 1,068,394
Non-covered loans, percent	59.07%	58.79%
Covered loans	$ 295	$ 332
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Non-covered loans	$ 57,986	$ 60,017
Non-covered loans, percent	3.22%	3.30%
Covered loans	$ 35	$ 39
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Non-covered loans	$ 96,614	$ 92,188
Non-covered loans, percent	5.37%	5.07%
Commercial Portfolio Segment [Member] | Multi-family Residential [Member]
Non-covered loans	$ 110,067	$ 125,202
Non-covered loans, percent	6.12%	6.89%
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Non-covered loans	$ 142,076	$ 141,670
Non-covered loans, percent	7.90%	7.80%
Covered loans	$ 252	$ 284
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Non-covered loans	$ 624,999	$ 616,633
Non-covered loans, percent	34.74%	33.93%
Covered loans	$ 8	$ 9
Commercial Portfolio Segment [Member] | Agricultural [Member]
Non-covered loans	$ 8,895	$ 7,035
Non-covered loans, percent	0.49%	0.39%
Commercial Portfolio Segment [Member] | Farmland [Member]
Non-covered loans	$ 22,055	$ 25,649
Non-covered loans, percent	1.23%	1.41%
Consumer Real Estate Portfolio Segment [Member]
Non-covered loans	$ 639,899	$ 645,069
Non-covered loans, percent	35.57%	35.50%
Covered loans	$ 22,624	$ 27,616
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Non-covered loans	$ 100,194	$ 103,205
Non-covered loans, percent	5.57%	5.68%
Covered loans	$ 19,151	$ 23,720
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Non-covered loans	$ 517,058	$ 502,686
Non-covered loans, percent	28.74%	27.66%
Covered loans	$ 3,473	$ 3,896
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]
Non-covered loans	$ 22,647	$ 39,178
Non-covered loans, percent	1.26%	2.16%
Consumer and Other Portfolio Segment [Member]
Non-covered loans	$ 73,521	$ 75,773
Non-covered loans, percent	4.09%	4.17%
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]
Non-covered loans	$ 68,885	$ 70,772
Non-covered loans, percent	3.83%	3.89%
Consumer and Other Portfolio Segment [Member] | Other Loan [Member]
Non-covered loans	$ 4,636	$ 5,001
Non-covered loans, percent	0.26%	0.28%

[1] Derived from audited financial statements