Note 4 - Credit Quality - Aging of Past Due Loans by Loan Class (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Past Due	$ 19,831	$ 21,478
Current Loans	1,815,952	1,831,470
Non-covered	1,784,371	1,795,954
Covered	51,412	56,994
Total loans	1,835,783	1,852,948
Non-covered Loans [Member]
Past Due	18,476	20,543
Current Loans	1,765,895	1,775,411
Covered Loans [Member]
Past Due	1,355	935
Current Loans	50,057	56,059
Financing Receivables, 30 to 59 Days Past Due [Member]
Past Due	6,992	9,355
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	6,248	8,699
Financing Receivables, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past Due	744	656
Financing Receivables, 60 to 89 Days Past Due [Member]
Past Due	3,896	3,990
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	3,821	3,844
Financing Receivables, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past Due	75	146
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	8,943	8,133
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	8,407	8,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past Due	536	133
Commercial Portfolio Segment [Member]
Non-covered	1,056,033	1,062,751
Covered	12,389	14,369
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Non-covered	61,070	56,948
Covered	4,337	4,570
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Non-covered Loans [Member]
Past Due	4	55
Current Loans	61,066	56,893
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Covered Loans [Member]
Past Due	892	466
Current Loans	3,445	4,104
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	4	33
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past Due	440	434
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past Due		5
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past Due
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past Due		17
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past Due	452	32
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Non-covered	88,370	92,204
Covered	637	895
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Non-covered Loans [Member]
Past Due	667	353
Current Loans	87,703	91,851
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Covered Loans [Member]
Past Due
Current Loans	637	895
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	23	174
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past Due
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	497	30
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past Due
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	147	149
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past Due
Commercial Portfolio Segment [Member] | Multi-family Residential [Member]
Non-covered	143,847	134,228
Covered	4	8
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Non-covered Loans [Member]
Past Due	468	444
Current Loans	143,379	133,784
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Covered Loans [Member]
Past Due
Current Loans	4	8
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	399	163
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past Due
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past Due
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past Due
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	69	281
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past Due
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Non-covered	143,308	142,965
Covered	980	962
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Non-covered Loans [Member]
Past Due	1,328	2,296
Current Loans	141,980	140,669
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Covered Loans [Member]
Past Due	23	24
Current Loans	957	938
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	571	1,302
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past Due	23	24
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	186	159
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past Due
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	571	835
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past Due
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Non-covered	584,064	598,674
Covered	6,020	7,512
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Non-covered Loans [Member]
Past Due	3,029	3,736
Current Loans	581,035	594,938
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Covered Loans [Member]
Past Due		32
Current Loans	6,020	7,480
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	481	1,235
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past Due		32
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	732	332
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past Due
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	1,816	2,169
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past Due
Commercial Portfolio Segment [Member] | Agricultural [Member]
Non-covered	6,133	6,003
Covered	25	25
Commercial Portfolio Segment [Member] | Agricultural [Member] | Non-covered Loans [Member]
Past Due	128	5
Current Loans	6,005	5,998
Commercial Portfolio Segment [Member] | Agricultural [Member] | Covered Loans [Member]
Past Due
Current Loans	25	25
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past Due
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past Due
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past Due		5
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past Due
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	128
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past Due
Commercial Portfolio Segment [Member] | Farmland [Member]
Non-covered	29,241	31,729
Covered	386	397
Commercial Portfolio Segment [Member] | Farmland [Member] | Non-covered Loans [Member]
Past Due	491	1,132
Current Loans	28,750	30,597
Commercial Portfolio Segment [Member] | Farmland [Member] | Covered Loans [Member]
Past Due
Current Loans	386	397
Commercial Portfolio Segment [Member] | Farmland [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	148	224
Commercial Portfolio Segment [Member] | Farmland [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past Due
Commercial Portfolio Segment [Member] | Farmland [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past Due		343
Commercial Portfolio Segment [Member] | Farmland [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past Due
Commercial Portfolio Segment [Member] | Farmland [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	343	565
Commercial Portfolio Segment [Member] | Farmland [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past Due
Consumer Real Estate Portfolio Segment [Member]
Non-covered	650,557	651,787
Covered	39,023	42,546
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Non-covered	104,817	106,361
Covered	32,943	35,817
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Non-covered Loans [Member]
Past Due	570	872
Current Loans	104,247	105,489
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Covered Loans [Member]
Past Due	159	316
Current Loans	32,784	35,501
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	160	78
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past Due	64	108
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	84	136
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past Due	50	146
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	326	658
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past Due	45	62
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Non-covered	500,394	500,891
Covered	6,080	6,729
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Non-covered Loans [Member]
Past Due	11,058	10,496
Current Loans	489,336	490,395
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Covered Loans [Member]
Past Due	281	97
Current Loans	5,799	6,632
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	4,100	4,777
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past Due	217	58
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	1,984	2,408
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past Due	25
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	4,974	3,311
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past Due	39	39
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]
Non-covered	45,346	44,535
Covered
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Non-covered Loans [Member]
Past Due	382	678
Current Loans	44,964	43,857
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Covered Loans [Member]
Past Due
Current Loans
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	102	342
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past Due
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	280	336
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past Due
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past Due
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past Due
Consumer and Other Portfolio Segment [Member]
Non-covered	77,781	81,416
Consumer and Other Portfolio Segment [Member] | Consumer Loan [Member]
Non-covered	73,634	77,445
Covered		79
Consumer and Other Portfolio Segment [Member] | Consumer Loan [Member] | Non-covered Loans [Member]
Past Due	202	476
Current Loans	73,432	76,969
Consumer and Other Portfolio Segment [Member] | Consumer Loan [Member] | Covered Loans [Member]
Past Due
Current Loans		79
Consumer and Other Portfolio Segment [Member] | Consumer Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	146	371
Consumer and Other Portfolio Segment [Member] | Consumer Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past Due
Consumer and Other Portfolio Segment [Member] | Consumer Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	23	90
Consumer and Other Portfolio Segment [Member] | Consumer Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past Due
Consumer and Other Portfolio Segment [Member] | Consumer Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	33	15
Consumer and Other Portfolio Segment [Member] | Consumer Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past Due
Consumer and Other Portfolio Segment [Member] | Other Loan [Member]
Non-covered	4,147	3,971
Consumer and Other Portfolio Segment [Member] | Other Loan [Member] | Non-covered Loans [Member]
Past Due	149
Current Loans	3,998	3,971
Consumer and Other Portfolio Segment [Member] | Other Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	114
Consumer and Other Portfolio Segment [Member] | Other Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past Due	35
Consumer and Other Portfolio Segment [Member] | Other Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past Due