Note 21 - Revenue From Contracts With Customers - Revenue by Operating Segment (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Non-interest income		$ 6,858	$ 5,726	$ 13,106	$ 11,944
Mortgage banking income	[1]	1,303	1,622	2,747	2,468
Bank owned life insurance	[1]	206	176	367	355
Other	[2]	629	595	1,399	875
Non-interest income		15,788	12,622	29,632	25,158
Commercial Banking [Member]
Non-interest income		0	0	0	0
Mortgage banking income	[1]	1,303	1,622	2,747	2,468
Bank owned life insurance	[1]	206	176	367	355
Other	[2]	629	595	1,399	875
Non-interest income		8,930	6,896	16,526	13,214
WM&T [Member]
Mortgage banking income	[1]	0	0	0	0
Bank owned life insurance	[1]	0	0	0	0
Other	[2]	0	0	0	0
Non-interest income		6,858	5,726	13,106	11,944
Fiduciary and Trust [Member]
Non-interest income		6,858	5,726	13,106	11,944
Fiduciary and Trust [Member] | Commercial Banking [Member]
Non-interest income		0	0	0	0
Fiduciary and Trust [Member] | WM&T [Member]
Non-interest income		6,858	5,726	13,106	11,944
Deposit Account [Member]
Non-interest income		1,233	800	2,177	2,083
Deposit Account [Member] | Commercial Banking [Member]
Non-interest income		1,233	800	2,177	2,083
Deposit Account [Member] | WM&T [Member]
Non-interest income		0	0	0	0
Credit and Debit Card [Member]
Non-interest income		3,284	2,063	5,557	4,043
Credit and Debit Card [Member] | Commercial Banking [Member]
Non-interest income		3,284	2,063	5,557	4,043
Credit and Debit Card [Member] | WM&T [Member]
Non-interest income		0	0	0	0
Treasury Management [Member]
Non-interest income		1,730	1,249	3,270	2,533
Treasury Management [Member] | Commercial Banking [Member]
Non-interest income		1,730	1,249	3,270	2,533
Treasury Management [Member] | WM&T [Member]
Non-interest income		0	0	0	0
Product Sales Commissions and Fees [Member]
Non-interest income		545	391	1,009	857
Product Sales Commissions and Fees [Member] | Commercial Banking [Member]
Non-interest income		545	391	1,009	857
Product Sales Commissions and Fees [Member] | WM&T [Member]
Non-interest income		$ 0	$ 0	$ 0	$ 0

[1] Outside of the scope of ASC 606.

[2] Outside of the scope of ASC 606, with the exception of safe deposit fees which were nominal for all periods.