Note 4 - Credit Quality - Loans by Credit Quality (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Non-covered loans	$ 1,776,112	$ 1,789,236	[1]
Covered loans	22,919	27,948
Total loans	1,799,031	1,817,184
Commercial Portfolio Segment [Member]
Non-covered loans	1,062,692	1,068,394
Covered loans	295	332
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Non-covered loans	57,986	60,017
Covered loans	35	39
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Non-covered loans	96,614	92,188
Commercial Portfolio Segment [Member] | Multi-family Residential [Member]
Non-covered loans	110,067	125,202
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Non-covered loans	142,076	141,670
Covered loans	252	284
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Non-covered loans	624,999	616,633
Covered loans	8	9
Commercial Portfolio Segment [Member] | Agricultural [Member]
Non-covered loans	8,895	7,035
Commercial Portfolio Segment [Member] | Farmland [Member]
Non-covered loans	22,055	25,649
Consumer Real Estate Portfolio Segment [Member]
Non-covered loans	639,899	645,069
Covered loans	22,624	27,616
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Non-covered loans	100,194	103,205
Covered loans	19,151	23,720
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Non-covered loans	517,058	502,686
Covered loans	3,473	3,896
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]
Non-covered loans	22,647	39,178
Consumer and Other Portfolio Segment [Member]
Non-covered loans	73,521	75,773
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]
Non-covered loans	68,885	70,772
Consumer and Other Portfolio Segment [Member] | Other Loan [Member]
Non-covered loans	4,636	5,001
Pass [Member]
Non-covered loans	1,700,400	1,706,888
Covered loans	13,284	14,600
Total loans	1,713,684	1,721,488
Pass [Member] | Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Non-covered loans	55,999	57,768
Covered loans		1
Pass [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Non-covered loans	93,472	87,181
Pass [Member] | Commercial Portfolio Segment [Member] | Multi-family Residential [Member]
Non-covered loans	105,533	118,509
Pass [Member] | Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Non-covered loans	132,858	130,689
Covered loans	235	265
Pass [Member] | Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Non-covered loans	604,886	596,616
Covered loans
Pass [Member] | Commercial Portfolio Segment [Member] | Agricultural [Member]
Non-covered loans	8,517	6,639
Pass [Member] | Commercial Portfolio Segment [Member] | Farmland [Member]
Non-covered loans	19,154	22,875
Pass [Member] | Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Non-covered loans	97,813	100,833
Covered loans	10,341	11,338
Pass [Member] | Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Non-covered loans	486,660	471,382
Covered loans	2,708	2,996
Pass [Member] | Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]
Non-covered loans	22,280	38,947
Pass [Member] | Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]
Non-covered loans	68,592	70,448
Pass [Member] | Consumer and Other Portfolio Segment [Member] | Other Loan [Member]
Non-covered loans	4,636	5,001
Special Mention [Member]
Non-covered loans	28,381	37,130
Covered loans	8,367	12,134
Total loans	36,748	49,264
Special Mention [Member] | Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Non-covered loans	835	1,367
Covered loans	35	38
Special Mention [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Non-covered loans	2,602	3,721
Special Mention [Member] | Commercial Portfolio Segment [Member] | Multi-family Residential [Member]
Non-covered loans	3,877	5,663
Special Mention [Member] | Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Non-covered loans	5,309	7,271
Covered loans
Special Mention [Member] | Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Non-covered loans	9,807	12,493
Covered loans
Special Mention [Member] | Commercial Portfolio Segment [Member] | Agricultural [Member]
Non-covered loans	202	294
Special Mention [Member] | Commercial Portfolio Segment [Member] | Farmland [Member]
Non-covered loans	321	210
Special Mention [Member] | Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Non-covered loans	597	618
Covered loans	7,954	11,685
Special Mention [Member] | Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Non-covered loans	4,824	5,480
Covered loans	378	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	7	13
Special Mention [Member] | Consumer and Other Portfolio Segment [Member] | Other Loan [Member]
Non-covered loans
Substandard [Member]
Non-covered loans	47,044	45,045
Covered loans	1,268	1,214
Total loans	48,312	46,259
Substandard [Member] | Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Non-covered loans	1,152	882
Covered loans
Substandard [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Non-covered loans	540	1,286
Substandard [Member] | Commercial Portfolio Segment [Member] | Multi-family Residential [Member]
Non-covered loans	657	1,030
Substandard [Member] | Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Non-covered loans	3,909	3,710
Covered loans	17	19
Substandard [Member] | Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Non-covered loans	10,160	7,351
Covered loans	8	9
Substandard [Member] | Commercial Portfolio Segment [Member] | Agricultural [Member]
Non-covered loans	176	102
Substandard [Member] | Commercial Portfolio Segment [Member] | Farmland [Member]
Non-covered loans	2,444	2,564
Substandard [Member] | Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Non-covered loans	1,784	1,754
Covered loans	856	697
Substandard [Member] | Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Non-covered loans	25,574	25,824
Covered loans	387	489
Substandard [Member] | Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]
Non-covered loans	367	231
Substandard [Member] | Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]
Non-covered loans	281	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	141
Covered loans
Total loans	141
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	136
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	5
Unlikely to be Collected Financing Receivable [Member] | Consumer and Other Portfolio Segment [Member] | Other Loan [Member]
Non-covered loans

[1] Derived from audited financial statements