Note 4 - Credit Quality - Aging of Past Due Loans by Loan Class (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Past due	$ 24,139	$ 27,739
Current loans	1,774,892	1,789,445
Non-covered	1,776,112	1,789,236	[1]
Covered	22,919	27,948
Total loans	1,799,031	1,817,184
Non-covered Loans [Member]
Past due	23,504	27,094
Current loans	1,752,608	1,762,142
Covered Loans [Member]
Past due	635	645
Current loans	22,284	27,303
Financing Receivables, 30 to 59 Days Past Due [Member]
Past due	7,372	12,110
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past due	7,164	11,638
Financing Receivables, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past due	208	472
Financing Receivables, 60 to 89 Days Past Due [Member]
Past due	2,331	3,882
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past due	2,201	3,882
Financing Receivables, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past due	130
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due	14,436	11,747
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past due	14,139	11,574
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past due	297	173
Commercial Portfolio Segment [Member]
Non-covered	1,062,692	1,068,394
Covered	295	332
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Non-covered	57,986	60,017
Covered	35	39
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Non-covered Loans [Member]
Past due	421	385
Current loans	57,565	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	33	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	388
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	96,614	92,188
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Non-covered Loans [Member]
Past due	501	414
Current loans	96,113	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	221	232
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past due	182	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	98	142
Commercial Portfolio Segment [Member] | Multi-family Residential [Member]
Non-covered	110,067	125,202
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Non-covered Loans [Member]
Past due	371	729
Current loans	109,696	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		544
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past due	371
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		185
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Non-covered	142,076	141,670
Covered	252	284
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Non-covered Loans [Member]
Past due	1,553	856
Current loans	140,523	140,814
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Covered Loans [Member]
Past due	17
Current loans	235	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	789	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	17
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	78	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	686	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	624,999	616,633
Covered	8	9
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Non-covered Loans [Member]
Past due	5,914	4,352
Current loans	619,085	612,281
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Covered Loans [Member]
Past due
Current loans	8	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	1,920	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	40	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	3,954	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	8,895	7,035
Commercial Portfolio Segment [Member] | Agricultural [Member] | Non-covered Loans [Member]
Past due	74	123
Current loans	8,821	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	74
Commercial Portfolio Segment [Member] | Farmland [Member]
Non-covered	22,055	25,649
Commercial Portfolio Segment [Member] | Farmland [Member] | Non-covered Loans [Member]
Past due	1,211	805
Current loans	20,844	24,844
Commercial Portfolio Segment [Member] | Farmland [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past due	216	113
Commercial Portfolio Segment [Member] | Farmland [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Non-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	995	692
Consumer Real Estate Portfolio Segment [Member]
Non-covered	639,899	645,069
Covered	22,624	27,616
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Non-covered	100,194	103,205
Covered	19,151	23,720
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Non-covered Loans [Member]
Past due	876	909
Current loans	99,318	102,296
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Covered Loans [Member]
Past due	618	575
Current loans	18,533	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	162	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	191	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	156	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	130
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	558	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	297	173
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Non-covered	517,058	502,686
Covered	3,473	3,896
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Non-covered Loans [Member]
Past due	11,899	17,563
Current loans	505,159	485,123
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Covered Loans [Member]
Past due		70
Current loans	3,473	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	3,344	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		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	1,233	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	7,322	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
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]
Non-covered	22,647	39,178
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Non-covered Loans [Member]
Past due	64	405
Current loans	22,583	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		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	64
Consumer and Other Portfolio Segment [Member]
Non-covered	73,521	75,773
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]
Non-covered	68,885	70,772
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member] | Non-covered Loans [Member]
Past due	620	553
Current loans	68,265	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	479	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	141	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		17
Consumer and Other Portfolio Segment [Member] | Other Loan [Member]
Non-covered	4,636	5,001
Consumer and Other Portfolio Segment [Member] | Other Loan [Member] | Non-covered Loans [Member]
Past due
Current loans	4,636	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

[1] Derived from audited financial statements