Note 4 - Loans and Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Internal credit risk grade groupings:
Loans	$ 2,073,482,000	$ 1,053,243,000
Originated Loan [Member] | Commercial and Industrial [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	220,771,000	208,151,000
Originated Loan [Member] | Commercial and Industrial [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	120,587,000	76,237,000
Originated Loan [Member] | Commercial and Industrial [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	1,017,000	1,985,000
Originated Loan [Member] | Commercial and Industrial [Member]
Internal credit risk grade groupings:
Loans	342,375,000	286,373,000
Originated Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	7,310,000	6,973,000
Originated Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	21,604,000	25,535,000
Originated Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	3,300,000	4,233,000
Originated Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member]
Internal credit risk grade groupings:
Loans	32,214,000	36,741,000
Originated Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	163,184,000	156,230,000
Originated Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	97,802,000	103,066,000
Originated Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	3,610,000	2,581,000
Originated Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member]
Internal credit risk grade groupings:
Loans	264,596,000	261,877,000
Originated Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	253,470,000	219,325,000
Originated Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	132,604,000	122,717,000
Originated Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	13,781,000	22,024,000
Originated Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member]
Internal credit risk grade groupings:
Loans	399,855,000	364,066,000
Originated Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	17,258,000	15,465,000
Originated Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	18,745,000	19,469,000
Originated Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	1,566,000	2,705,000
Originated Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member]
Internal credit risk grade groupings:
Loans	37,569,000	37,639,000
Originated Loan [Member]
Internal credit risk grade groupings:
Loans	1,145,097,000	1,053,243,000	1,058,662,000
Acquired Loan [Member] | Commercial and Industrial [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	111,223,000
Acquired Loan [Member] | Commercial and Industrial [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	154,550,000
Acquired Loan [Member] | Commercial and Industrial [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	7,911,000
Acquired Loan [Member] | Commercial and Industrial [Member]
Internal credit risk grade groupings:
Loans	273,684,000	0
Acquired Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	4,240,000
Acquired Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	15,552,000
Acquired Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	1,299,000
Acquired Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member]
Internal credit risk grade groupings:
Loans	21,091,000	0
Acquired Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	28,670,000
Acquired Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	83,142,000
Acquired Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	8,006,000
Acquired Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member]
Internal credit risk grade groupings:
Loans	119,818,000	0
Acquired Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	44,344,000
Acquired Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	100,032,000
Acquired Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	5,058,000
Acquired Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member]
Internal credit risk grade groupings:
Loans	149,434,000	0
Acquired Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member] | Grade 1 - 4 [Member]
Internal credit risk grade groupings:
Loans	19,438,000
Acquired Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member] | Grade 5 - 7 [Member]
Internal credit risk grade groupings:
Loans	27,051,000
Acquired Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member] | Grade 8 - 9 [Member]
Internal credit risk grade groupings:
Loans	610,000
Acquired Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member]
Internal credit risk grade groupings:
Loans	47,099,000	0
Acquired Loan [Member]
Internal credit risk grade groupings:
Loans	928,385,000	0
Commercial and Industrial [Member]
Internal credit risk grade groupings:
Loans	616,059,000	286,373,000
Commercial Vacant Land and Land Development and Residential Construction Loan [Member]
Internal credit risk grade groupings:
Loans	53,305,000	36,741,000
Commercial Real Estate Owner Occupied Loan [Member]
Internal credit risk grade groupings:
Loans	384,414,000	261,877,000
Commercial Real Estate Non Owner Occupied Loan [Member]
Internal credit risk grade groupings:
Loans	549,289,000	364,066,000
Commercial Real Estate Multi Family and Residential Rental Loan [Member]
Internal credit risk grade groupings:
Loans	$ 84,668,000	$ 37,639,000