Note 3 - Loans and Allowance for Credit Losses on Loans - Aging of the Recorded Investment in Loans (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Current	[1]	$ 3,629,162	$ 3,514,657
Past due	[1]	5,994	16,939
Loans	[1],[2]	3,635,156	3,531,596
Financial Asset, 30 to 59 Days Past Due [Member]
Past due	[1]	1,583	2,749
Financial Asset, 60 to 89 Days Past Due [Member]
Past due	[1]	908	11,420
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	[1]	3,503	2,770
Home Equity Line of Credit [Member]
Current	[1]	90,778	95,206
Past due	[1]	455	160
Loans	[1]	91,233	95,366
Home Equity Line of Credit [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due	[1]	243	7
Home Equity Line of Credit [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due	[1]	19	139
Home Equity Line of Credit [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	[1]	193	14
Commercial Real Estate Portfolio Segment [Member]
Current	[1]	1,401,752	1,329,464
Past due	[1]	2,087	12,678
Loans	[1]	1,403,839	1,342,142
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due	[1]	721	278
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due	[1]	155	10,600
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	[1]	1,211	1,800
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Current	[1]	875,452	822,199
Past due	[1]	1,071	11,271
Loans	[1]	876,523	833,470
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due	[1]	374	0
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due	[1]	0	10,600
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	[1]	697	671
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Current	[1]	526,300	507,265
Past due	[1]	1,016	1,407
Loans	[1]	527,316	508,672
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due	[1]	347	278
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due	[1]	155	0
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	[1]	514	1,129
Commercial and Industrial Portfolio Segment [Member] | Term, Excluding PPP [Member]
Current	[1]	507,642	523,936
Past due	[1]	1,925	1,840
Loans	[1]	509,567	525,776
Commercial and Industrial Portfolio Segment [Member] | Term, Excluding PPP [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due	[1]	118	1,404
Commercial and Industrial Portfolio Segment [Member] | Term, Excluding PPP [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due	[1]	517	430
Commercial and Industrial Portfolio Segment [Member] | Term, Excluding PPP [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	[1]	1,290	6
Commercial and Industrial Portfolio Segment [Member] | Term [Member]
Loans			525,776
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member]
Current	[1]	612,885	550,186
Past due	[1]	0	0
Loans	[1]	612,885	550,186
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member]
Past due	[1]	0	0
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member]
Past due	[1]	0	0
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member]
Past due	[1]	0	0
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member]
Current	[1]	260,055	276,472
Past due	[1]	151	174
Loans	[1]	260,206	276,646
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due	[1]	74	86
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due	[1]	0	0
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	[1]	77	88
Total Commercial and Industrial Portfolio Segment [Member]
Current	[1]	1,380,582	1,350,594
Past due	[1]	2,076	2,014
Loans	[1]	1,382,658	1,352,608
Total Commercial and Industrial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due	[1]	192	1,490
Total Commercial and Industrial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due	[1]	517	430
Total Commercial and Industrial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	[1]	1,367	94
Residential Real Estate Portfolio Segment [Member]
Current	[1]	397,607	378,136
Past due	[1]	1,289	1,985
Loans	[1]	398,896	380,121
Residential Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due	[1]	343	879
Residential Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due	[1]	217	247
Residential Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	[1]	729	859
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Current	[1]	136,257	140,234
Past due	[1]	123	696
Loans	[1]	136,380	140,930
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due	[1]	23	294
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due	[1]	0	0
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	[1]	100	402
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Current	[1]	261,350	237,902
Past due	[1]	1,166	1,289
Loans	[1]	262,516	239,191
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due	[1]	320	585
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due	[1]	217	247
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	[1]	629	457
Construction and Development [Member]
Current	[1]	281,815	291,764
Past due	[1]	0	0
Loans	[1]	281,815	291,764
Construction and Development [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due	[1]	0	0
Construction and Development [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due	[1]	0	0
Construction and Development [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	[1]	0	0
Consumer Portfolio Segment [Member]
Current	[1]	50,994	44,510
Past due	[1]	64	96
Loans	[1]	51,058	44,606
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due	[1]	61	90
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due	[1]	0	4
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	[1]	3	2
Finance Leases Portfolio Segment [Member]
Current	[1]	14,115	14,786
Past due	[1]	0	0
Loans	[1]	14,115	14,786
Finance Leases Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due	[1]	0	0
Finance Leases Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due	[1]	0	0
Finance Leases Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	[1]	0	0
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member]
Current	[1]	11,519	10,197
Past due	[1]	23	6
Loans	[1]	11,542	10,203
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due	[1]	23	5
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due	[1]	0	0
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	[1]	$ 0	$ 1

[1] Pursuant to the CARES Act, loan deferrals granted to borrowers experiencing business interruptions related to the pandemic were not classified as TDRs and not included in past due and/or non-performing loan statistics. As of March 31, 2021 and December 31, 2020, outstanding loan deferrals of $14 million and $37 million are reflected as current, respectively.

[2] Total loans are presented inclusive of premiums, discounts and net loan origination fees and costs.