Note 6 - Premises and Equipment (Details) - Premises and Equipment (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Premises and equipment	$ 47,624	$ 34,346
Less accumulated depreciation	(12,594)	(11,598)
Net premises and equipment	35,030	22,748
Land [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment	4,216	200
Building [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment	9,375	1,057
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment	19,592	19,017
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment	10,035	7,670
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment	$ 4,406	$ 6,402