Note 21 - Revenue From Contracts With Customers - Revenue by Operating Segment (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Non-interest income		$ 5,439	$ 5,500
Mortgage banking income	[1]	482	576
Bank owned life insurance	[1]	178	187
Other	[2]	459	276
Non-interest income		11,062	10,909
Commercial Banking [Member]
Non-interest income
Mortgage banking income	[1]	482	576
Bank owned life insurance	[1]	178	187
Other	[2]	459	276
Non-interest income		5,623	5,409
WM&T [Member]
Mortgage banking income	[1]
Bank owned life insurance	[1]
Other	[2]
Non-interest income		5,439	5,500
Fiduciary and Trust [Member]
Non-interest income		5,439	5,500
Fiduciary and Trust [Member] | Commercial Banking [Member]
Non-interest income
Fiduciary and Trust [Member] | WM&T [Member]
Non-interest income		5,439	5,500
Deposit Account [Member]
Non-interest income		1,247	1,411
Deposit Account [Member] | Commercial Banking [Member]
Non-interest income		1,247	1,411
Deposit Account [Member] | WM&T [Member]
Non-interest income
Credit and Debit Card [Member]
Non-interest income		1,744	1,508
Credit and Debit Card [Member] | Commercial Banking [Member]
Non-interest income		1,744	1,508
Credit and Debit Card [Member] | WM&T [Member]
Non-interest income
Treasury Management [Member]
Non-interest income		1,157	1,047
Treasury Management [Member] | Commercial Banking [Member]
Non-interest income		1,157	1,047
Treasury Management [Member] | WM&T [Member]
Non-interest income
Product Sales Commissions and Fees [Member]
Non-interest income		356	404
Product Sales Commissions and Fees [Member] | Commercial Banking [Member]
Non-interest income		356	404
Product Sales Commissions and Fees [Member] | WM&T [Member]
Non-interest income

[1] Outside of scope of ASC 606

[2] Outside of scope of ASC 606 with the exception of safe deposit fee which were nominal.