Note 5 - Credit Quality - Aging of Past Due Loans by Loan Class (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Past due	$ 29,634	$ 33,453
Current loans	2,156,998	2,081,007
Non-covered	2,176,952	2,101,599
Loans held for investment, covered	9,680	12,861
Loans held for investment, net of unearned income (includes covered loans of $9,680 and $12,861, respectively)	2,186,632	2,114,460
Non-covered Loans [Member]
Past due	29,271	33,231
Current loans	2,147,681	2,068,368
Covered Loans [Member]
Past due	363	222
Current loans	9,317	12,639
Financial Asset, 30 to 59 Days Past Due [Member]
Past due	12,135	16,236
Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past due	12,026	16,092
Financial Asset, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past due	109	144
Financial Asset, 60 to 89 Days Past Due [Member]
Past due	4,594	6,104
Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past due	4,594	6,026
Financial Asset, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past due	0	78
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	12,905	11,113
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past due	12,651	11,113
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past due	254	0
Commercial Portfolio Segment [Member]
Non-covered	1,284,735	1,238,814
Loans held for investment, covered	210	230
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Non-covered	44,649	48,659
Loans held for investment, covered	25	28
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Non-covered Loans [Member]
Past due	1,274	339
Current loans	43,375	48,320
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Covered Loans [Member]
Past due	0	0
Current loans	25	28
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past due	1,039	63
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past due	0	0
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past due	0	65
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past due	0	0
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past due	235	211
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past due	0	0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Non-covered	173,024	142,962
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Non-covered Loans [Member]
Past due	1,599	2,658
Current loans	171,425	140,304
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past due	669	1,913
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past due	230	238
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past due	700	507
Commercial Portfolio Segment [Member] | Multi-family Residential [Member]
Non-covered	115,161	121,840
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Non-covered Loans [Member]
Past due	1,049	1,519
Current loans	114,112	120,321
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past due	103	375
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past due	0	0
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past due	946	1,144
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Non-covered	187,598	163,181
Loans held for investment, covered	185	199
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Non-covered Loans [Member]
Past due	3,557	1,682
Current loans	184,041	161,499
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Covered Loans [Member]
Past due	0	0
Current loans	185	199
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past due	925	754
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past due	0	0
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past due	488	267
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past due	0	0
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past due	2,144	661
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past due	0	0
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Non-covered	734,793	727,261
Loans held for investment, covered	0	3
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Non-covered Loans [Member]
Past due	4,265	5,893
Current loans	730,528	721,368
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Covered Loans [Member]
Past due		0
Current loans		3
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past due	601	917
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past due		0
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past due	296	1,949
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past due		0
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past due	3,368	3,027
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past due		0
Commercial Portfolio Segment [Member] | Agricultural [Member]
Non-covered	9,749	11,756
Commercial Portfolio Segment [Member] | Agricultural [Member] | Non-covered Loans [Member]
Past due	347	250
Current loans	9,402	11,506
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past due	70	86
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past due	189	164
Commercial Portfolio Segment [Member] | Agricultural [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past due	88	0
Commercial Portfolio Segment [Member] | Farmland [Member]
Non-covered	19,761	23,155
Commercial Portfolio Segment [Member] | Farmland [Member] | Non-covered Loans [Member]
Past due	500	1,869
Current loans	19,261	21,286
Commercial Portfolio Segment [Member] | Farmland [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past due	43	856
Commercial Portfolio Segment [Member] | Farmland [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past due	0	349
Commercial Portfolio Segment [Member] | Farmland [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past due	457	664
Consumer Real Estate Portfolio Segment [Member]
Non-covered	765,830	748,016
Loans held for investment, covered	9,470	12,631
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Non-covered	89,432	110,078
Loans held for investment, covered	7,094	9,853
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Non-covered Loans [Member]
Past due	1,125	2,104
Current loans	88,307	107,974
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Covered Loans [Member]
Past due	329	172
Current loans	6,765	9,681
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past due	574	1,436
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past due	75	144
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past due	380	165
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past due	0	28
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past due	171	503
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past due	254	0
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Non-covered	658,678	620,697
Loans held for investment, covered	2,376	2,778
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Non-covered Loans [Member]
Past due	11,439	13,884
Current loans	647,239	606,813
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Covered Loans [Member]
Past due	34	50
Current loans	2,342	2,728
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past due	5,283	7,728
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Covered Loans [Member]
Past due	34	0
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past due	2,265	2,390
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Covered Loans [Member]
Past due	0	50
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past due	3,891	3,766
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Covered Loans [Member]
Past due	0	0
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]
Non-covered	17,720	17,241
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Non-covered Loans [Member]
Past due	82	635
Current loans	17,638	16,606
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past due	82	207
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past due	0	0
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past due	0	428
Consumer and Other Portfolio Segment [Member]
Non-covered	126,387	114,769
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]
Non-covered	120,373	110,027
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member] | Non-covered Loans [Member]
Past due	4,034	2,376
Current loans	116,339	107,651
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past due	2,637	1,735
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past due	746	439
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past due	651	202
Consumer and Other Portfolio Segment [Member] | Other Loan [Member]
Non-covered	6,014	4,742
Consumer and Other Portfolio Segment [Member] | Other Loan [Member] | Non-covered Loans [Member]
Past due	0	22
Current loans	6,014	4,720
Consumer and Other Portfolio Segment [Member] | Other Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-covered Loans [Member]
Past due	0	22
Consumer and Other Portfolio Segment [Member] | Other Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-covered Loans [Member]
Past due	0	0
Consumer and Other Portfolio Segment [Member] | Other Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-covered Loans [Member]
Past due	$ 0	$ 0