Note 26 - Quarterly Operating Results (Unaudited) (Details) - Quarterly Operating Results - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Note 26 - Quarterly Operating Results (Unaudited) (Details) - Quarterly Operating Results [Line Items]
Interest income	$ 93,170	$ 89,087	$ 86,464
Interest expense	4,852	5,330	9,166
Net interest income	88,318	83,757	77,298
Provision for loan losses	750	(400)	6,550
Net interest income after provision	87,568	84,157	70,748
Non-interest income	39,950	39,155	39,002
Non-interest expenses	73,398	73,209	71,352
Income before income taxes	54,120	50,103	38,398
Income tax expense	$ 16,933	$ 15,281	$ 11,228
Basic earnings per share (in Dollars per share)	$ 2.53	$ 2.39	$ 1.91
Diluted earnings per share (in Dollars per share)	$ 2.48	$ 2.36	$ 1.89
Fourth Quarter [Member]
Note 26 - Quarterly Operating Results (Unaudited) (Details) - Quarterly Operating Results [Line Items]
Interest income	$ 24,039	$ 22,778	$ 22,069
Interest expense	1,217	1,267	2,226
Net interest income	22,822	21,511	19,843
Provision for loan losses	750		1,575
Net interest income after provision	22,072	21,511	18,268
Non-interest income	10,073	9,773	9,811
Non-interest expenses	18,322	19,255	19,380
Income before income taxes	13,823	12,029	8,699
Income tax expense	4,177	3,307	2,386
Net income	$ 9,646	$ 8,722	$ 6,313
Basic earnings per share (in Dollars per share)	$ 0.65	$ 0.60	$ 0.44
Diluted earnings per share (in Dollars per share)	$ 0.64	$ 0.59	$ 0.43
Third Quarter [Member]
Note 26 - Quarterly Operating Results (Unaudited) (Details) - Quarterly Operating Results [Line Items]
Interest income	$ 23,284	$ 22,692	$ 22,267
Interest expense	1,203	1,329	2,250
Net interest income	22,081	21,363	20,017
Provision for loan losses		(2,100)	1,325
Net interest income after provision	22,081	23,463	18,692
Non-interest income	9,985	9,850	9,652
Non-interest expenses	18,430	18,709	17,571
Income before income taxes	13,636	14,604	10,773
Income tax expense	4,352	4,715	3,091
Net income	$ 9,284	$ 9,889	$ 7,682
Basic earnings per share (in Dollars per share)	$ 0.63	$ 0.68	$ 0.53
Diluted earnings per share (in Dollars per share)	$ 0.62	$ 0.67	$ 0.53
Second Quarter [Member]
Note 26 - Quarterly Operating Results (Unaudited) (Details) - Quarterly Operating Results [Line Items]
Interest income	$ 23,000	$ 22,013	$ 21,293
Interest expense	1,199	1,358	2,318
Net interest income	21,801	20,655	18,975
Provision for loan losses		1,350	1,325
Net interest income after provision	21,801	19,305	17,650
Non-interest income	10,219	10,057	10,311
Non-interest expenses	18,867	17,701	18,822
Income before income taxes	13,153	11,661	9,139
Income tax expense	4,151	3,627	2,732
Net income	$ 9,002	$ 8,034	$ 6,407
Basic earnings per share (in Dollars per share)	$ 0.61	$ 0.55	$ 0.45
Diluted earnings per share (in Dollars per share)	$ 0.60	$ 0.55	$ 0.45
First Quarter [Member]
Note 26 - Quarterly Operating Results (Unaudited) (Details) - Quarterly Operating Results [Line Items]
Interest income	$ 22,847	$ 21,604	$ 20,835
Interest expense	1,233	1,376	2,372
Net interest income	21,614	20,228	18,463
Provision for loan losses		350	2,325
Net interest income after provision	21,614	19,878	16,138
Non-interest income	9,673	9,475	9,228
Non-interest expenses	17,779	17,544	15,579
Income before income taxes	13,508	11,809	9,787
Income tax expense	4,253	3,632	3,019
Net income	$ 9,255	$ 8,177	$ 6,768
Basic earnings per share (in Dollars per share)	$ 0.63	$ 0.56	$ 0.49
Diluted earnings per share (in Dollars per share)	$ 0.62	$ 0.56	$ 0.49