Note 4 - Credit Quality - Aging of Past Due Loans by Loan Class (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Past due	$ 20,624	$ 27,739
Current loans	1,770,285	1,789,445
Non-covered	1,770,426	1,789,236
Loans held for investment, covered	20,483	27,948
Loans held for investment, net of unearned income (including covered loans of $20,483 and $27,948)	1,790,909	1,817,184
Non-covered Loans [Member]
Past due	20,086	27,094
Current loans	1,750,340	1,762,142
Covered Loans [Member]
Past due	538	645
Current loans	19,945	27,303
Financing Receivables, 30 to 59 Days Past Due [Member]
Past due	6,610	12,110
Financing Receivables, 30 to 59 Days Past Due [Member] \| Non-covered Loans [Member]
Past due	6,367	11,638
Financing Receivables, 30 to 59 Days Past Due [Member] \| Covered Loans [Member]
Past due	243	472
Financing Receivables, 60 to 89 Days Past Due [Member]
Past due	3,345	3,882
Financing Receivables, 60 to 89 Days Past Due [Member] \| Non-covered Loans [Member]
Past due	3,106	3,882
Financing Receivables, 60 to 89 Days Past Due [Member] \| Covered Loans [Member]
Past due	239
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due	10,669	11,747
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Non-covered Loans [Member]
Past due	10,613	11,574
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Covered Loans [Member]
Past due	56	173
Commercial Portfolio Segment [Member]
Non-covered	1,060,249	1,068,394
Loans held for investment, covered	287	332
Commercial Portfolio Segment [Member] \| Construction, Development and Other Land [Member]
Non-covered	62,657	60,017
Loans held for investment, covered	35	39
Commercial Portfolio Segment [Member] \| Construction, Development and Other Land [Member] \| Non-covered Loans [Member]
Past due	565	385
Current loans	62,092	59,632
Commercial Portfolio Segment [Member] \| Construction, Development and Other Land [Member] \| Covered Loans [Member]
Past due
Current loans	35	39
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	87	20
Commercial Portfolio Segment [Member] \| Construction, Development and Other Land [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Covered Loans [Member]
Past due
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		365
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	478
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
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Non-covered	105,603	92,188
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member] \| Non-covered Loans [Member]
Past due	650	414
Current loans	104,953	91,774
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Non-covered Loans [Member]
Past due	174	232
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Non-covered Loans [Member]
Past due	260	40
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	216	142
Commercial Portfolio Segment [Member] \| Multi-family Residential [Member]
Non-covered	112,710	125,202
Commercial Portfolio Segment [Member] \| Multi-family Residential [Member] \| Non-covered Loans [Member]
Past due	1,663	729
Current loans	111,047	124,473
Commercial Portfolio Segment [Member] \| Multi-family Residential [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Non-covered Loans [Member]
Past due	148	544
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, Equal to Greater than 90 Days Past Due [Member] \| Non-covered Loans [Member]
Past due	1,515	185
Commercial Portfolio Segment [Member] \| Single Family Non-owner Occupied [Member]
Non-covered	142,591	141,670
Loans held for investment, covered	245	284
Commercial Portfolio Segment [Member] \| Single Family Non-owner Occupied [Member] \| Non-covered Loans [Member]
Past due	1,924	856
Current loans	140,667	140,814
Commercial Portfolio Segment [Member] \| Single Family Non-owner Occupied [Member] \| Covered Loans [Member]
Past due
Current loans	245	284
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	762	223
Commercial Portfolio Segment [Member] \| Single Family Non-owner Occupied [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Covered Loans [Member]
Past due
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	281	302
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	881	331
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	606,800	616,633
Loans held for investment, covered	7	9
Commercial Portfolio Segment [Member] \| Non-farm, Non-residential [Member] \| Non-covered Loans [Member]
Past due	3,428	4,352
Current loans	603,372	612,281
Commercial Portfolio Segment [Member] \| Non-farm, Non-residential [Member] \| Covered Loans [Member]
Past due
Current loans	7	9
Commercial Portfolio Segment [Member] \| Non-farm, Non-residential [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Non-covered Loans [Member]
Past due	795	2,433
Commercial Portfolio Segment [Member] \| Non-farm, Non-residential [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Covered Loans [Member]
Past due
Commercial Portfolio Segment [Member] \| Non-farm, Non-residential [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Non-covered Loans [Member]
Past due	74	383
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	2,559	1,536
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	9,016	7,035
Commercial Portfolio Segment [Member] \| Agricultural [Member] \| Non-covered Loans [Member]
Past due		123
Current loans	9,016	6,912
Commercial Portfolio Segment [Member] \| Agricultural [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Non-covered Loans [Member]
Past due		123
Commercial Portfolio Segment [Member] \| Agricultural [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Non-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
Commercial Portfolio Segment [Member] \| Farmland [Member]
Non-covered	20,872	25,649
Commercial Portfolio Segment [Member] \| Farmland [Member] \| Non-covered Loans [Member]
Past due	932	805
Current loans	19,940	24,844
Commercial Portfolio Segment [Member] \| Farmland [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Non-covered Loans [Member]
Past due	201	113
Commercial Portfolio Segment [Member] \| Farmland [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Non-covered Loans [Member]
Past due	321
Commercial Portfolio Segment [Member] \| Farmland [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Non-covered Loans [Member]
Past due	410	692
Consumer Real Estate Portfolio Segment [Member]
Non-covered	635,071	645,069
Loans held for investment, covered	20,196	27,616
Consumer Real Estate Portfolio Segment [Member] \| Home Equity Lines [Member]
Non-covered	96,819	103,205
Loans held for investment, covered	16,804	23,720
Consumer Real Estate Portfolio Segment [Member] \| Home Equity Lines [Member] \| Non-covered Loans [Member]
Past due	1,077	909
Current loans	95,742	102,296
Consumer Real Estate Portfolio Segment [Member] \| Home Equity Lines [Member] \| Covered Loans [Member]
Past due	449	575
Current loans	16,355	23,145
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	379	226
Consumer Real Estate Portfolio Segment [Member] \| Home Equity Lines [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Covered Loans [Member]
Past due	184	402
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	199	198
Consumer Real Estate Portfolio Segment [Member] \| Home Equity Lines [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Covered Loans [Member]
Past due	239
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	499	485
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	26	173
Consumer Real Estate Portfolio Segment [Member] \| Single Family Owner Occupied [Member]
Non-covered	520,363	502,686
Loans held for investment, covered	3,392	3,896
Consumer Real Estate Portfolio Segment [Member] \| Single Family Owner Occupied [Member] \| Non-covered Loans [Member]
Past due	8,987	17,563
Current loans	511,376	485,123
Consumer Real Estate Portfolio Segment [Member] \| Single Family Owner Occupied [Member] \| Covered Loans [Member]
Past due	89	70
Current loans	3,303	3,826
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	3,247	6,959
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	59	70
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	1,802	2,418
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
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	3,938	8,186
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	30
Consumer Real Estate Portfolio Segment [Member] \| Owner Occupied Construction [Member]
Non-covered	17,889	39,178
Consumer Real Estate Portfolio Segment [Member] \| Owner Occupied Construction [Member] \| Non-covered Loans [Member]
Past due	90	405
Current loans	17,799	38,773
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	90	326
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		79
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 and Other Portfolio Segment [Member]
Non-covered	75,106	75,773
Consumer and Other Portfolio Segment [Member] \| Consumer Loans [Member]
Non-covered	69,974	70,772
Consumer and Other Portfolio Segment [Member] \| Consumer Loans [Member] \| Non-covered Loans [Member]
Past due	770	553
Current loans	69,204	70,219
Consumer and Other Portfolio Segment [Member] \| Consumer Loans [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Non-covered Loans [Member]
Past due	484	439
Consumer and Other Portfolio Segment [Member] \| Consumer Loans [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Non-covered Loans [Member]
Past due	169	97
Consumer and Other Portfolio Segment [Member] \| Consumer Loans [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Non-covered Loans [Member]
Past due	117	17
Consumer and Other Portfolio Segment [Member] \| Other Loan [Member]
Non-covered	5,132	5,001
Consumer and Other Portfolio Segment [Member] \| Other Loan [Member] \| Non-covered Loans [Member]
Past due
Current loans	5,132	5,001
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

Sep. 30, 2018

Dec. 31, 2017

Past due

$ 20,624

$ 27,739

Current loans

1,770,285

1,789,445

Non-covered

1,770,426

1,789,236