Note 4 - Credit Quality - Aging of Past Due Loans by Loan Class (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Covered	$ 45,845	$ 56,994
Non-covered	1,796,263	1,795,954
Past Due	18,122	21,478
Current Loans	1,823,986	1,831,470
Total loans	1,842,108	1,852,948
Non-covered Loans [Member]
Past Due	17,592	20,543
Current Loans	1,778,671	1,775,411
Covered Loans [Member]
Past Due	530	935
Current Loans	45,315	56,059
Financing Receivables, 30 to 59 Days Past Due [Member]
Past Due	6,115	9,355
Financing Receivables, 30 to 59 Days Past Due [Member] \| Non-covered Loans [Member]
Past Due	5,832	8,699
Financing Receivables, 30 to 59 Days Past Due [Member] \| Covered Loans [Member]
Past Due	283	656
Financing Receivables, 60 to 89 Days Past Due [Member]
Past Due	2,574	3,990
Financing Receivables, 60 to 89 Days Past Due [Member] \| Non-covered Loans [Member]
Past Due	2,447	3,844
Financing Receivables, 60 to 89 Days Past Due [Member] \| Covered Loans [Member]
Past Due	127	146
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	9,433	8,133
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Non-covered Loans [Member]
Past Due	9,313	8,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Covered Loans [Member]
Past Due	120	133
Commercial Portfolio Segment [Member]
Covered	9,351	14,369
Non-covered	1,069,660	1,062,751
Commercial Portfolio Segment [Member] \| Construction, Development and Other Land [Member]
Covered	3,560	4,570
Non-covered	58,869	56,948
Commercial Portfolio Segment [Member] \| Construction, Development and Other Land [Member] \| Non-covered Loans [Member]
Past Due	111	55
Current Loans	58,758	56,893
Commercial Portfolio Segment [Member] \| Construction, Development and Other Land [Member] \| Covered Loans [Member]
Past Due	17	466
Current Loans	3,543	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	111	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		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	17	32
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Covered	603	895
Non-covered	89,455	92,204
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member] \| Non-covered Loans [Member]
Past Due	468	353
Current Loans	88,987	91,851
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member] \| Covered Loans [Member]
Past Due
Current Loans	603	895
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Non-covered Loans [Member]
Past Due	215	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	107	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	146	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]
Covered		8
Non-covered	141,228	134,228
Commercial Portfolio Segment [Member] \| Multi-family Residential [Member] \| Non-covered Loans [Member]
Past Due	269	444
Current Loans	140,959	133,784
Commercial Portfolio Segment [Member] \| Multi-family Residential [Member] \| Covered Loans [Member]
Past Due
Current Loans		8
Commercial Portfolio Segment [Member] \| Multi-family Residential [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Non-covered Loans [Member]
Past Due	200	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]
Covered	1,020	962
Non-covered	142,150	142,965
Commercial Portfolio Segment [Member] \| Single Family Non-owner Occupied [Member] \| Non-covered Loans [Member]
Past Due	2,089	2,296
Current Loans	140,061	140,669
Commercial Portfolio Segment [Member] \| Single Family Non-owner Occupied [Member] \| Covered Loans [Member]
Past Due		24
Current Loans	1,020	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	1,321	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		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	25	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	743	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]
Covered	3,768	7,512
Non-covered	603,272	598,674
Commercial Portfolio Segment [Member] \| Non-farm, Non-residential [Member] \| Non-covered Loans [Member]
Past Due	2,733	3,736
Current Loans	600,539	594,938
Commercial Portfolio Segment [Member] \| Non-farm, Non-residential [Member] \| Covered Loans [Member]
Past Due		32
Current Loans	3,768	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	484	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	179	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	2,070	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]
Covered	24	25
Non-covered	6,086	6,003
Commercial Portfolio Segment [Member] \| Agricultural [Member] \| Non-covered Loans [Member]
Past Due	128	5
Current Loans	5,958	5,998
Commercial Portfolio Segment [Member] \| Agricultural [Member] \| Covered Loans [Member]
Past Due
Current Loans	24	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]
Covered	376	397
Non-covered	28,600	31,729
Commercial Portfolio Segment [Member] \| Farmland [Member] \| Non-covered Loans [Member]
Past Due	485	1,132
Current Loans	28,115	30,597
Commercial Portfolio Segment [Member] \| Farmland [Member] \| Covered Loans [Member]
Past Due
Current Loans	376	397
Commercial Portfolio Segment [Member] \| Farmland [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Non-covered Loans [Member]
Past Due	142	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]
Covered	36,494	42,546
Non-covered	649,916	651,787
Consumer Real Estate Portfolio Segment [Member] \| Home Equity Lines [Member]
Covered	30,818	35,817
Non-covered	102,460	106,361
Consumer Real Estate Portfolio Segment [Member] \| Home Equity Lines [Member] \| Non-covered Loans [Member]
Past Due	543	872
Current Loans	101,917	105,489
Consumer Real Estate Portfolio Segment [Member] \| Home Equity Lines [Member] \| Covered Loans [Member]
Past Due	442	316
Current Loans	30,376	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	128	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	283	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	115	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	124	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	300	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	35	62
Consumer Real Estate Portfolio Segment [Member] \| Single Family Owner Occupied [Member]
Covered	5,676	6,729
Non-covered	500,582	500,891
Consumer Real Estate Portfolio Segment [Member] \| Single Family Owner Occupied [Member] \| Non-covered Loans [Member]
Past Due	10,049	10,496
Current Loans	490,533	490,395
Consumer Real Estate Portfolio Segment [Member] \| Single Family Owner Occupied [Member] \| Covered Loans [Member]
Past Due	71	97
Current Loans	5,605	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	2,582	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		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	1,956	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	3
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	5,511	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	68	39
Consumer Real Estate Portfolio Segment [Member] \| Owner Occupied Construction [Member]
Covered
Non-covered	46,874	44,535
Consumer Real Estate Portfolio Segment [Member] \| Owner Occupied Construction [Member] \| Non-covered Loans [Member]
Past Due	282	678
Current Loans	46,592	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	282	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		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	76,687	81,416
Consumer and Other Portfolio Segment [Member] \| Consumer Loan [Member]
Covered		79
Non-covered	72,391	77,445
Consumer and Other Portfolio Segment [Member] \| Consumer Loan [Member] \| Non-covered Loans [Member]
Past Due	435	476
Current Loans	71,956	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	367	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	65	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	3	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	4,296	3,971
Consumer and Other Portfolio Segment [Member] \| Other Loan [Member] \| Non-covered Loans [Member]
Past Due
Current Loans	4,296	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
Consumer and Other Portfolio Segment [Member] \| Other Loan [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Non-covered Loans [Member]
Past Due
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

Note 4 - Credit Quality - Aging of Past Due Loans by Loan Class (Details) - USD ($)
$ in Thousands

Jun. 30, 2017

Dec. 31, 2016

Covered

$ 45,845

$ 56,994

Non-covered

1,796,263

1,795,954

Past Due

18,122

21,478