Note 16 - Revenue from Contracts with Customers - Summary of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues	[1]									$ 32,236	$ 31,481	$ 27,985
Noninterest income, not in-scope	[2]									10,584	13,270	3,722
Total non-interest income		$ 11,451	$ 9,977	$ 15,606	$ 5,786	$ 8,648	$ 10,388	$ 12,794	$ 12,921	42,820	44,751	31,707
Fees and Services Charges on Deposit Account [Member]
Revenues	[1]									7,965	7,848	8,387
Wealth Management Fees [Member]
Revenues	[1]									10,529	9,241	5,905
Other Service Fees [Member]
Revenues	[1],[3]									$ 13,742	$ 14,392	$ 13,693

[1] There were no adjustments to the Company's financial statements recorded as a result of the adoption of ASC 606. For comparability, the Company has adjusted consolidated prior period amounts to conform to the periods presentation.

[2] These amounts primarily represent revenue from contracts with customers that are out of the scope of ASC 606.

[3] Other service fees comprise of fees related to letters of credit, wire fees, fees on foreign exchange transactions and other immaterial individual revenue streams