Note 20 - Parent Company Financial Statements (Details) - Condensed Statements of Income and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income
Other noninterest income									$ 450	$ 984	$ 74
Expense
Interest expense – subordinated notes payable to unconsolidated trusts									866	844	864
Noninterest expense	$ 14,685	$ 14,281	$ 14,474	$ 14,510	$ 14,774	$ 15,751	$ 14,323	$ 14,430	57,950	59,278	61,573
Income before income tax benefit and equity in undistributed income of subsidiaries	4,664	5,271	4,871	5,479	5,895	5,390	6,783	4,490	20,285	22,558	17,881
Income tax benefit	1,080	1,439	1,369	1,405	1,737	1,283	1,959	1,120	5,293	6,099	4,435
Net income	$ 3,584	$ 3,832	$ 3,502	$ 4,074	$ 4,158	$ 4,107	$ 4,824	$ 3,370	14,992	16,459	13,446
Other comprehensive income (loss)									(2,093)	8,087	(10,081)
Comprehensive income									12,899	24,546	3,365
Parent Company [Member]
Income
Dividends from subsidiaries									14,426	16,525	14,566
Interest									12	28	29
Other noninterest income									2,555	3,132	3,740
Total income									16,993	19,685	18,335
Expense
Interest expense – subordinated notes payable to unconsolidated trusts									866	844	864
Noninterest expense									4,938	3,977	3,980
Total expense									5,804	4,821	4,844
Income before income tax benefit and equity in undistributed income of subsidiaries									11,189	14,864	13,491
Income tax benefit									(1,076)	(555)	(428)
Income before equity in undistributed income of subsidiaries									12,265	15,419	13,919
Equity in undistributed income (loss) of subsidiaries									2,727	1,040	(473)
Net income									14,992	16,459	13,446
Other comprehensive income (loss)									(2,093)	8,087	(10,081)
Comprehensive income									$ 12,899	$ 24,546	$ 3,365