Note 20 - Revenue From Contracts With Customers - Revenue by Operating Segment (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Non-interest income		$ 6,248	$ 6,218
Mortgage banking income	[1]	1,444	846
Bank owned life insurance	[1]	161	179
Other	[2]	770	280
Non-interest income		13,844	12,536
Commercial Banking [Member]
Non-interest income		0	0
Mortgage banking income	[1]	1,444	846
Bank owned life insurance	[1]	161	179
Other	[2]	770	280
Non-interest income		7,596	6,318
WM&T [Member]
Mortgage banking income	[1]	0	0
Bank owned life insurance	[1]	0	0
Other	[2]	0	0
Non-interest income		6,248	6,218
Fiduciary and Trust [Member]
Non-interest income		6,248	6,218
Fiduciary and Trust [Member] | Commercial Banking [Member]
Non-interest income		0	0
Fiduciary and Trust [Member] | WM&T [Member]
Non-interest income		6,248	6,218
Deposit Account [Member]
Non-interest income		944	1,283
Deposit Account [Member] | Commercial Banking [Member]
Non-interest income		944	1,283
Deposit Account [Member] | WM&T [Member]
Non-interest income		0	0
Credit and Debit Card [Member]
Non-interest income		2,273	1,980
Credit and Debit Card [Member] | Commercial Banking [Member]
Non-interest income		2,273	1,980
Credit and Debit Card [Member] | WM&T [Member]
Non-interest income		0	0
Treasury Management [Member]
Non-interest income		1,540	1,284
Treasury Management [Member] | Commercial Banking [Member]
Non-interest income		1,540	1,284
Treasury Management [Member] | WM&T [Member]
Non-interest income		0	0
Product Sales Commissions and Fees [Member]
Non-interest income		464	466
Product Sales Commissions and Fees [Member] | Commercial Banking [Member]
Non-interest income		464	466
Product Sales Commissions and Fees [Member] | WM&T [Member]
Non-interest income		$ 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.