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, 2016	Sep. 30, 2016		Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Gain on debt extinguishment										$ 4,050
Other noninterest income										420	450	984
Interest on subordinated notes payable to unconsolidated trusts										723	866	844
Noninterest expense	$ 15,221	$ 17,888	[1]	$ 13,884	$ 14,407	$ 14,685	$ 14,281	$ 14,474	$ 14,510	61,400	57,950	59,278
Income before income tax benefit and equity in undistributed income of subsidiaries	3,476	5,884		4,791	8,895	4,664	5,271	4,871	5,479
Income tax expense	931	1,560		1,235	2,715	1,080	1,439	1,369	1,405	6,441	5,293	6,099
Net income	$ 2,545	$ 4,324		$ 3,556	$ 6,180	$ 3,584	$ 3,832	$ 3,502	$ 4,074	16,605	14,992	16,459
Other comprehensive income										(6,190)	(2,093)	8,087
Comprehensive income										10,415	12,899	24,546
Parent Company [Member]
Dividends from subsidiaries										24,820	14,426	16,525
Interest										39	12	28
Gain on debt extinguishment										4,050
Other noninterest income										2,442	2,555	3,132
Total income										31,351	16,993	19,685
Interest on subordinated notes payable to unconsolidated trusts										723	866	844
Noninterest expense										5,050	4,938	3,977
Total expense										5,773	5,804	4,821
Income before income tax benefit and equity in undistributed income of subsidiaries										25,578	11,189	14,864
Income tax expense										273	(1,076)	(555)
Income before equity in undistributed income of subsidiaries										25,305	12,265	15,419
Equity in undistributed (loss) income of subsidiaries										(8,700)	2,727	1,040
Net income										16,605	14,992	16,459
Other comprehensive income										(6,190)	(2,093)	8,087
Comprehensive income										$ 10,415	$ 12,899	$ 24,546

[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.