Note 3 - Loans - Loans by Class (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Total loans held for investment, net of unearned income	$ 2,152,103	$ 2,186,632
Total loans held for investment, net of unearned income, percent	100.00%	100.00%
Commercial Portfolio Segment [Member]
Non-covered loans	$ 1,227,038	$ 1,284,945
Non-covered loans, percent	57.01%	58.76%
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Non-covered loans	$ 56,466	$ 44,674
Non-covered loans, percent	2.62%	2.04%
Total loans held for investment, net of unearned income	$ 56,466
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Non-covered loans	$ 133,923	$ 173,024
Non-covered loans, percent	6.22%	7.91%
Total loans held for investment, net of unearned income	$ 106,993
Commercial Portfolio Segment [Member] | Multi-family Residential [Member]
Non-covered loans	$ 100,444	$ 115,161
Non-covered loans, percent	4.67%	5.27%
Total loans held for investment, net of unearned income	$ 100,444
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Non-covered loans	$ 196,946	$ 187,783
Non-covered loans, percent	9.15%	8.59%
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Non-covered loans	$ 711,861	$ 734,793
Non-covered loans, percent	33.08%	33.60%
Total loans held for investment, net of unearned income	$ 711,861
Commercial Portfolio Segment [Member] | Agricultural [Member]
Non-covered loans	$ 9,784	$ 9,749
Non-covered loans, percent	0.45%	0.45%
Total loans held for investment, net of unearned income	$ 9,784
Commercial Portfolio Segment [Member] | Farmland [Member]
Non-covered loans	$ 17,614	$ 19,761
Non-covered loans, percent	0.82%	0.90%
Total loans held for investment, net of unearned income	$ 17,614
Consumer Real Estate Portfolio Segment [Member]
Non-covered loans	$ 793,560	$ 775,300
Non-covered loans, percent	36.88%	35.46%
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Non-covered loans	$ 83,079	$ 96,526
Non-covered loans, percent	3.86%	4.41%
Total loans held for investment, net of unearned income	$ 83,079
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Non-covered loans	$ 684,930	$ 661,054
Non-covered loans, percent	31.83%	30.24%
Total loans held for investment, net of unearned income	$ 881,876
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]
Non-covered loans	$ 25,551	$ 17,720
Non-covered loans, percent	1.19%	0.81%
Total loans held for investment, net of unearned income	$ 25,551
Consumer and Other Portfolio Segment [Member]
Non-covered loans	$ 131,505	$ 126,387
Non-covered loans, percent	6.11%	5.78%
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]
Non-covered loans	$ 126,578	$ 120,373
Non-covered loans, percent	5.88%	5.50%
Total loans held for investment, net of unearned income	$ 131,505
Consumer and Other Portfolio Segment [Member] | Other Loan [Member]
Non-covered loans	$ 4,927	$ 6,014
Non-covered loans, percent	0.23%	0.28%