Note 4 - Loans and Allowance for Loan Losses (Details) - Components of Loan Portfolio (USD $)	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Commercial:
Loans (in Dollars)	$ 2,073,482,000	$ 1,053,243,000
Loans, percentage of portfolio	100.00%	100.00%
Loans, percentage of change in loans	96.90%
Originated Loan [Member] | Commercial and Industrial [Member]
Commercial:
Loans (in Dollars)	342,375,000	286,373,000
Loans, percentage of portfolio	29.90%	27.20%
Loans, percentage of change in loans	19.60%
Originated Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member]
Commercial:
Loans (in Dollars)	32,214,000	36,741,000
Loans, percentage of portfolio	2.80%	3.50%
Loans, percentage of change in loans	(12.30%)
Originated Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member]
Commercial:
Loans (in Dollars)	264,596,000	261,877,000
Loans, percentage of portfolio	23.10%	24.90%
Loans, percentage of change in loans	1.00%
Originated Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member]
Commercial:
Loans (in Dollars)	399,855,000	364,066,000
Loans, percentage of portfolio	34.90%	34.60%
Loans, percentage of change in loans	9.80%
Originated Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member]
Commercial:
Loans (in Dollars)	37,569,000	37,639,000
Loans, percentage of portfolio	3.30%	3.50%
Loans, percentage of change in loans	(0.20%)
Originated Loan [Member] | Commercial Portfolio Segment [Member]
Commercial:
Loans (in Dollars)	1,076,609,000	986,696,000	985,616,000
Loans, percentage of portfolio	94.00%	93.70%
Loans, percentage of change in loans	9.10%
Originated Loan [Member] | Retail Home Equity and Other [Member]
Commercial:
Loans (in Dollars)	35,151,000	35,080,000
Loans, percentage of portfolio	3.10%	3.30%
Loans, percentage of change in loans	0.20%
Originated Loan [Member] | Retail 1-4 Family Mortgages [Member]
Commercial:
Loans (in Dollars)	33,337,000	31,467,000
Loans, percentage of portfolio	2.90%	3.00%
Loans, percentage of change in loans	5.90%
Originated Loan [Member] | Retail Loan [Member]
Commercial:
Loans (in Dollars)	68,488,000	66,547,000	73,046,000
Loans, percentage of portfolio	6.00%	6.30%
Loans, percentage of change in loans	2.90%
Originated Loan [Member]
Commercial:
Loans (in Dollars)	1,145,097,000	1,053,243,000	1,058,662,000
Loans, percentage of portfolio	100.00%	100.00%
Loans, percentage of change in loans	8.70%
Acquired Loan [Member] | Commercial and Industrial [Member]
Commercial:
Loans (in Dollars)	273,684,000	0
Loans, percentage of portfolio	29.50%
Loans, percentage of change in loans
Acquired Loan [Member] | Commercial Vacant Land and Land Development and Residential Construction Loan [Member]
Commercial:
Loans (in Dollars)	21,091,000	0
Loans, percentage of portfolio	2.30%
Loans, percentage of change in loans
Acquired Loan [Member] | Commercial Real Estate Owner Occupied Loan [Member]
Commercial:
Loans (in Dollars)	119,818,000	0
Loans, percentage of portfolio	12.90%
Loans, percentage of change in loans
Acquired Loan [Member] | Commercial Real Estate Non Owner Occupied Loan [Member]
Commercial:
Loans (in Dollars)	149,434,000	0
Loans, percentage of portfolio	16.10%
Loans, percentage of change in loans
Acquired Loan [Member] | Commercial Real Estate Multi Family and Residential Rental Loan [Member]
Commercial:
Loans (in Dollars)	47,099,000	0
Loans, percentage of portfolio	5.10%
Loans, percentage of change in loans
Acquired Loan [Member] | Commercial Portfolio Segment [Member]
Commercial:
Loans (in Dollars)	611,126,000	0
Loans, percentage of portfolio	65.80%
Loans, percentage of change in loans
Acquired Loan [Member] | Retail Home Equity and Other [Member]
Commercial:
Loans (in Dollars)	134,557,000	0
Loans, percentage of portfolio	14.50%
Loans, percentage of change in loans
Acquired Loan [Member] | Retail 1-4 Family Mortgages [Member]
Commercial:
Loans (in Dollars)	182,702,000	0
Loans, percentage of portfolio	19.70%
Loans, percentage of change in loans
Acquired Loan [Member] | Retail Loan [Member]
Commercial:
Loans (in Dollars)	317,259,000	0
Loans, percentage of portfolio	34.20%
Loans, percentage of change in loans
Acquired Loan [Member]
Commercial:
Loans (in Dollars)	928,385,000	0
Loans, percentage of portfolio	100.00%
Loans, percentage of change in loans
Commercial and Industrial [Member]
Commercial:
Loans (in Dollars)	616,059,000	286,373,000
Loans, percentage of portfolio	29.70%	27.20%
Loans, percentage of change in loans	115.10%
Commercial Vacant Land and Land Development and Residential Construction Loan [Member]
Commercial:
Loans (in Dollars)	53,305,000	36,741,000
Loans, percentage of portfolio	2.60%	3.50%
Loans, percentage of change in loans	45.10%
Commercial Real Estate Owner Occupied Loan [Member]
Commercial:
Loans (in Dollars)	384,414,000	261,877,000
Loans, percentage of portfolio	18.50%	24.90%
Loans, percentage of change in loans	46.80%
Commercial Real Estate Non Owner Occupied Loan [Member]
Commercial:
Loans (in Dollars)	549,289,000	364,066,000
Loans, percentage of portfolio	26.50%	34.60%
Loans, percentage of change in loans	50.90%
Commercial Real Estate Multi Family and Residential Rental Loan [Member]
Commercial:
Loans (in Dollars)	84,668,000	37,639,000
Loans, percentage of portfolio	4.10%	3.50%
Loans, percentage of change in loans	124.90%
Commercial Portfolio Segment [Member]
Commercial:
Loans (in Dollars)	1,687,735,000	986,696,000
Loans, percentage of portfolio	81.40%	93.70%
Loans, percentage of change in loans	71.00%
Retail Home Equity and Other [Member]
Commercial:
Loans (in Dollars)	169,708,000	35,080,000
Loans, percentage of portfolio	8.20%	3.30%
Loans, percentage of change in loans	383.80%
Retail 1-4 Family Mortgages [Member]
Commercial:
Loans (in Dollars)	216,039,000	31,467,000
Loans, percentage of portfolio	10.40%	3.00%
Loans, percentage of change in loans	586.60%
Retail Loan [Member]
Commercial:
Loans (in Dollars)	$ 385,747,000	$ 66,547,000
Loans, percentage of portfolio	18.60%	6.30%
Loans, percentage of change in loans	479.70%