Note 19 - Revenue From Contracts With Customers - Revenue by Operating Segment (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Non-interest income		$ 5,657	$ 5,738	$ 17,601	$ 16,839
Mortgage banking income	[1]	1,979	794	4,447	2,004
Bank owned life insurance	[1]	172	487	527	849
Other	[2]	220	1,068	1,095	2,199
Non-interest income		13,043	13,209	38,201	36,441
Commercial Banking [Member]
Non-interest income		0	0	0	0
Mortgage banking income	[1]	1,979	794	4,447	2,004
Bank owned life insurance	[1]	172	487	527	849
Other	[2]	220	1,068	1,095	2,199
Non-interest income		7,386	7,471	20,600	19,602
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		5,657	5,738	17,601	16,839
Fiduciary and Trust [Member]
Non-interest income		5,657	5,738	17,601	16,839
Fiduciary and Trust [Member] | Commercial Banking [Member]
Non-interest income		0	0	0	0
Fiduciary and Trust [Member] | WM&T [Member]
Non-interest income		5,657	5,738	17,601	16,839
Deposit Account [Member]
Non-interest income		998	1,356	3,081	3,793
Deposit Account [Member] | Commercial Banking [Member]
Non-interest income		998	1,356	3,081	3,793
Deposit Account [Member] | WM&T [Member]
Non-interest income		0	0	0	0
Credit and Debit Card [Member]
Non-interest income		2,218	2,102	6,261	6,014
Credit and Debit Card [Member] | Commercial Banking [Member]
Non-interest income		2,218	2,102	6,261	6,014
Credit and Debit Card [Member] | WM&T [Member]
Non-interest income		0	0	0	0
Treasury Management [Member]
Non-interest income		1,368	1,264	3,901	3,623
Treasury Management [Member] | Commercial Banking [Member]
Non-interest income		1,368	1,264	3,901	3,623
Treasury Management [Member] | WM&T [Member]
Non-interest income		0	0	0	0
Product Sales Commissions and Fees [Member]
Non-interest income		431	400	1,288	1,120
Product Sales Commissions and Fees [Member] | Commercial Banking [Member]
Non-interest income		431	400	1,288	1,120
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.