Note 21 - Revenue From Contracts With Customers - Revenue by Operating Segment (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Mortgage banking income	[1]	$ 915	$ 1,979	$ 3,662	$ 4,447
Bank owned life insurance	[1]	275	172	642	527
Other	[2]	1,090	220	2,489	1,095
Non-interest income		17,614	13,043	47,246	38,201
Commercial Banking [Member]
Mortgage banking income	[1]	915	1,979	3,662	4,447
Bank owned life insurance	[1]	275	172	642	527
Other	[2]	1,090	220	2,489	1,095
Non-interest income		10,486	7,386	27,012	20,600
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		7,128	5,657	20,234	17,601
Fiduciary and Trust [Member]
Non-interest income		7,128	5,657	20,234	17,601
Fiduciary and Trust [Member] | Commercial Banking [Member]
Non-interest income		0	0	0	0
Fiduciary and Trust [Member] | WM&T [Member]
Non-interest income		7,128	5,657	20,234	17,601
Deposit Account [Member]
Non-interest income		1,768	998	3,945	3,081
Deposit Account [Member] | Commercial Banking [Member]
Non-interest income		1,768	998	3,945	3,081
Deposit Account [Member] | WM&T [Member]
Non-interest income		0	0	0	0
Credit and Debit Card [Member]
Non-interest income		3,887	2,218	9,444	6,261
Credit and Debit Card [Member] | Commercial Banking [Member]
Non-interest income		3,887	2,218	9,444	6,261
Credit and Debit Card [Member] | WM&T [Member]
Non-interest income		0	0	0	0
Treasury Management [Member]
Non-interest income		1,771	1,368	5,041	3,901
Treasury Management [Member] | Commercial Banking [Member]
Non-interest income		1,771	1,368	5,041	3,901
Treasury Management [Member] | WM&T [Member]
Non-interest income		0	0	0	0
Product Sales Commissions and Fees [Member]
Non-interest income		780	431	1,789	1,288
Product Sales Commissions and Fees [Member] | Commercial Banking [Member]
Non-interest income		780	431	1,789	1,288
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.