Note 20 - Parent Company Financial Statements (Details) - Condensed Statements of Income and Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income
Other noninterest income									$ 984	$ 74	$ 277
Expense
Interest expense - subordinated notes payable to unconsolidated trusts									844	864	1,879
Noninterest expense	14,774	15,751	14,323	14,430	16,358	15,984	14,722	14,509	59,278	61,573	59,787
Income before income tax benefit and equity in undistributed income of subsidiaries	5,895	5,390	6,783	4,490	4,207	3,890	4,674	5,110	22,558	17,881	15,059
Income tax benefit	1,737	1,283	1,959	1,120	1,135	855	1,127	1,318	6,099	4,435	2,910
Net income	4,158	4,107	4,824	3,370	3,072	3,035	3,547	3,792	16,459	13,446	12,149
Other comprehensive income (loss)									8,087	(10,081)	226
Comprehensive income									24,546	3,365	12,375
Parent Company [Member]
Income
Dividends from subsidiaries									16,525	14,566	12,012
Interest									28	29	19
Other noninterest income									3,132	3,740	3,476
Total income									19,685	18,335	15,507
Expense
Interest expense - subordinated notes payable to unconsolidated trusts									844	864	1,879
Noninterest expense									3,977	3,980	3,875
Total expense									4,821	4,844	5,754
Income before income tax benefit and equity in undistributed income of subsidiaries									14,864	13,491	9,753
Income tax benefit									(555)	(428)	(759)
Income before equity in undistributed income of subsidiaries									15,419	13,919	10,512
Equity in undistributed income (loss) of subsidiaries									1,040	(473)	1,637
Net income									16,459	13,446	12,149
Other comprehensive income (loss)									8,087	(10,081)	226
Comprehensive income									$ 24,546	$ 3,365	$ 12,375