Note 19 - Parent Company Financial Information - Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other assets	$ 35,752	$ 35,627
Total Assets	5,065,735	3,341,290
Total Liabilities	4,757,622	3,092,122
Shareholders’ Equity
Total Shareholders’ Equity	308,113	249,168	$ 245,189	$ 226,460
Total Liabilities and Shareholders’ Equity	5,065,735	3,341,290
Parent Company [Member]
Cash	22,872	6,327
Corporation-obligated mandatorily redeemable capital securities of subsidiary trust holding junior obligations of the corporation	341	341
Investment in subsidiaries	287,114	245,158
Other assets	9,347	8,640
Total Assets	319,674	260,466
Accrued expenses	290	33
Corporation-obligated mandatorily redeemable securities of subsidiary trust holding solely junior subordinated debentures of the corporation	11,271	11,265
Total Liabilities	11,561	11,298
Shareholders’ Equity
Total Shareholders’ Equity	308,113	249,168	$ 245,189	$ 226,460
Total Liabilities and Shareholders’ Equity	$ 319,674	$ 260,466