Note 5 - Credit Quality - Loans by Credit Quality (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Non-covered loans	$ 1,756,269	$ 1,789,236
Covered loans	18,815	27,948
Total loans	1,775,084	1,817,184
Commercial Portfolio Segment [Member]
Non-covered loans	1,056,807	1,068,394
Covered loans	279	332
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Non-covered loans	63,508	60,017
Covered loans	35	39
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Non-covered loans	104,863	92,188
Commercial Portfolio Segment [Member] | Multi-family Residential [Member]
Non-covered loans	107,012	125,202
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Non-covered loans	140,097	141,670
Covered loans	238	284
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Non-covered loans	613,877	616,633
Covered loans	6	9
Commercial Portfolio Segment [Member] | Agricultural [Member]
Non-covered loans	8,545	7,035
Commercial Portfolio Segment [Member] | Farmland [Member]
Non-covered loans	18,905	25,649
Consumer Real Estate Portfolio Segment [Member]
Non-covered loans	622,600	645,069
Covered loans	18,536	27,616
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Non-covered loans	93,466	103,205
Covered loans	15,284	23,720
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Non-covered loans	510,963	502,686
Covered loans	3,252	3,896
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]
Non-covered loans	18,171	39,178
Consumer and Other Portfolio Segment [Member]
Non-covered loans	76,862	75,773
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]
Non-covered loans	71,552	70,772
Consumer and Other Portfolio Segment [Member] | Other Loan [Member]
Non-covered loans	5,310	5,001
Pass [Member]
Non-covered loans	1,688,842	1,706,888
Covered loans	12,241	14,600
Total loans	1,701,083	1,721,488
Pass [Member] | Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Non-covered loans	61,877	57,768
Covered loans		1
Pass [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Non-covered loans	102,044	87,181
Pass [Member] | Commercial Portfolio Segment [Member] | Multi-family Residential [Member]
Non-covered loans	104,183	118,509
Pass [Member] | Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Non-covered loans	131,443	130,689
Covered loans	223	265
Pass [Member] | Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Non-covered loans	595,659	596,616
Covered loans
Pass [Member] | Commercial Portfolio Segment [Member] | Agricultural [Member]
Non-covered loans	8,328	6,639
Pass [Member] | Commercial Portfolio Segment [Member] | Farmland [Member]
Non-covered loans	16,898	22,875
Pass [Member] | Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Non-covered loans	91,194	100,833
Covered loans	9,511	11,338
Pass [Member] | Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Non-covered loans	482,794	471,382
Covered loans	2,507	2,996
Pass [Member] | Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]
Non-covered loans	17,872	38,947
Pass [Member] | Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]
Non-covered loans	71,240	70,448
Pass [Member] | Consumer and Other Portfolio Segment [Member] | Other Loan [Member]
Non-covered loans	5,310	5,001
Special Mention [Member]
Non-covered loans	22,152	37,130
Covered loans	5,634	12,134
Total loans	27,786	49,264
Special Mention [Member] | Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Non-covered loans	661	1,367
Covered loans	35	38
Special Mention [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Non-covered loans	2,166	3,721
Special Mention [Member] | Commercial Portfolio Segment [Member] | Multi-family Residential [Member]
Non-covered loans	1,087	5,663
Special Mention [Member] | Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Non-covered loans	4,395	7,271
Covered loans
Special Mention [Member] | Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Non-covered loans	8,166	12,493
Covered loans
Special Mention [Member] | Commercial Portfolio Segment [Member] | Agricultural [Member]
Non-covered loans	131	294
Special Mention [Member] | Commercial Portfolio Segment [Member] | Farmland [Member]
Non-covered loans	538	210
Special Mention [Member] | Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Non-covered loans	649	618
Covered loans	5,244	11,685
Special Mention [Member] | Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Non-covered loans	4,355	5,480
Covered loans	355	411
Special Mention [Member] | Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]
Non-covered loans
Special Mention [Member] | Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]
Non-covered loans	4	13
Special Mention [Member] | Consumer and Other Portfolio Segment [Member] | Other Loan [Member]
Non-covered loans
Substandard [Member]
Non-covered loans	45,129	45,045
Covered loans	940	1,214
Total loans	46,069	46,259
Substandard [Member] | Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Non-covered loans	970	882
Covered loans
Substandard [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Non-covered loans	653	1,286
Substandard [Member] | Commercial Portfolio Segment [Member] | Multi-family Residential [Member]
Non-covered loans	1,742	1,030
Substandard [Member] | Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Non-covered loans	4,259	3,710
Covered loans	15	19
Substandard [Member] | Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Non-covered loans	9,906	7,351
Covered loans	6	9
Substandard [Member] | Commercial Portfolio Segment [Member] | Agricultural [Member]
Non-covered loans	86	102
Substandard [Member] | Commercial Portfolio Segment [Member] | Farmland [Member]
Non-covered loans	1,469	2,564
Substandard [Member] | Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Non-covered loans	1,623	1,754
Covered loans	529	697
Substandard [Member] | Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Non-covered loans	23,814	25,824
Covered loans	390	489
Substandard [Member] | Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]
Non-covered loans	299	231
Substandard [Member] | Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]
Non-covered loans	308	311
Substandard [Member] | Consumer and Other Portfolio Segment [Member] | Other Loan [Member]
Non-covered loans
Doubtful [Member]
Non-covered loans	146	173
Covered loans
Total loans	146	173
Doubtful [Member] | Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Non-covered loans
Covered loans
Doubtful [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Non-covered loans
Doubtful [Member] | Commercial Portfolio Segment [Member] | Multi-family Residential [Member]
Non-covered loans
Doubtful [Member] | Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Non-covered loans
Covered loans
Doubtful [Member] | Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Non-covered loans	146	173
Covered loans
Doubtful [Member] | Commercial Portfolio Segment [Member] | Agricultural [Member]
Non-covered loans
Doubtful [Member] | Commercial Portfolio Segment [Member] | Farmland [Member]
Non-covered loans
Doubtful [Member] | Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Non-covered loans
Covered loans
Doubtful [Member] | Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Non-covered loans
Covered loans
Doubtful [Member] | Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]
Non-covered loans
Doubtful [Member] | Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]
Non-covered loans
Doubtful [Member] | Consumer and Other Portfolio Segment [Member] | Other Loan [Member]
Non-covered loans
Unlikely to be Collected Financing Receivable [Member]
Non-covered loans
Covered loans
Total loans
Unlikely to be Collected Financing Receivable [Member] | Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Non-covered loans
Covered loans
Unlikely to be Collected Financing Receivable [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Non-covered loans
Unlikely to be Collected Financing Receivable [Member] | Commercial Portfolio Segment [Member] | Multi-family Residential [Member]
Non-covered loans
Unlikely to be Collected Financing Receivable [Member] | Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Non-covered loans
Covered loans
Unlikely to be Collected Financing Receivable [Member] | Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Non-covered loans
Covered loans
Unlikely to be Collected Financing Receivable [Member] | Commercial Portfolio Segment [Member] | Agricultural [Member]
Non-covered loans
Unlikely to be Collected Financing Receivable [Member] | Commercial Portfolio Segment [Member] | Farmland [Member]
Non-covered loans
Unlikely to be Collected Financing Receivable [Member] | Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Non-covered loans
Covered loans
Unlikely to be Collected Financing Receivable [Member] | Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Non-covered loans
Covered loans
Unlikely to be Collected Financing Receivable [Member] | Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]
Non-covered loans
Unlikely to be Collected Financing Receivable [Member] | Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]
Non-covered loans
Unlikely to be Collected Financing Receivable [Member] | Consumer and Other Portfolio Segment [Member] | Other Loan [Member]
Non-covered loans