Note 20 - Parent Company Financial Statements - Condensed Statements of Income and Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2017		Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016		Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Gain on debt extinguishment											$ 0	$ 4,050	$ 0
Other noninterest income											509	420	450
Interest on subordinated notes payable to unconsolidated trusts											870	723	866
Noninterest expense	$ 13,240		$ 12,708	$ 13,346	$ 13,529	$ 15,221	$ 17,888	$ 13,884	[1]	$ 14,407	52,823	61,400	57,950
Income before income taxes	6,132		7,388	6,204	4,605	3,476	5,884	4,791		8,895
Income tax expense	7,567	[2]	2,076	1,722	1,276	931	1,560	1,235		2,715	12,641	6,441	5,293
Net income	$ (1,435)		$ 5,312	$ 4,482	$ 3,329	$ 2,545	$ 4,324	$ 3,556		$ 6,180	11,688	16,605	14,992
Other comprehensive loss											475	(6,190)	(2,093)
Comprehensive income											12,163	10,415	12,899
Parent Company [Member]
Dividends from subsidiaries											23,026	24,820	14,426
Interest											191	39	12
Gain on debt extinguishment												4,050
Other noninterest income											363	2,442	2,555
Total income											23,580	31,351	16,993
Interest on subordinated notes payable to unconsolidated trusts											870	723	866
Noninterest expense											1,751	5,050	4,938
Total expense											2,621	5,773	5,804
Income before income taxes											20,959	25,578	11,189
Income tax expense											(747)	273	(1,076)
Income before equity in undistributed income of subsidiaries											21,706	25,305	12,265
Equity in undistributed (loss) income of subsidiaries											(10,018)	(8,700)	2,727
Net income											11,688	16,605	14,992
Other comprehensive loss											475	(6,190)	(2,093)
Comprehensive income											$ 12,163	$ 10,415	$ 12,899

[1] Noninterest income includes $3.8 million of gain on the sale of investment securities and noninterest expense includes $3.8 million of loss on the early extinguishment of debt, both related to a series of transactions to deleverage the balance sheet.

[2] Income tax expense includes $5.9 million related to the remeasurement of the Company's net deferred tax assets due to the change in Federal tax rates.