Note 4 - Loans and Allowance for Loan Losses (Details) - Components of Loan Portfolio - USD ($)	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 2,171,832,000	$ 2,089,277,000
Loans, percentage of portfolio	100.00%	100.00%
Loans, percentage of change in loans	4.00%
Originated Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 1,429,623,000	$ 1,246,116,000	$ 1,145,097,000
Loans, percentage of portfolio	100.00%	100.00%
Loans, percentage of change in loans	14.70%
Acquired Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 742,209,000	$ 843,161,000
Loans, percentage of portfolio	100.00%	100.00%
Loans, percentage of change in loans	(12.00%)
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 1,820,431,000	$ 1,715,303,000
Loans, percentage of portfolio	83.80%	82.10%
Loans, percentage of change in loans	6.10%
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 622,073,000	$ 550,607,000
Loans, percentage of portfolio	28.70%	26.40%
Loans, percentage of change in loans	13.00%
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 47,622,000	$ 51,974,000
Loans, percentage of portfolio	2.20%	2.50%
Loans, percentage of change in loans	(8.40%)
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 422,354,000	$ 430,388,000
Loans, percentage of portfolio	19.40%	20.50%
Loans, percentage of change in loans	(1.90%)
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 603,724,000	$ 559,574,000
Loans, percentage of portfolio	27.80%	26.80%
Loans, percentage of change in loans	7.90%
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 124,658,000	$ 122,760,000
Loans, percentage of portfolio	5.70%	5.90%
Loans, percentage of change in loans	1.50%
Commercial Portfolio Segment [Member] | Originated Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 1,322,388,000	$ 1,153,189,000	1,076,609,000
Loans, percentage of portfolio	92.50%	92.50%
Loans, percentage of change in loans	14.70%
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 487,440,000	$ 384,570,000
Loans, percentage of portfolio	34.10%	30.80%
Loans, percentage of change in loans	26.70%
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 28,853,000	$ 29,826,000
Loans, percentage of portfolio	2.00%	2.40%
Loans, percentage of change in loans	(3.30%)
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 297,694,000	$ 291,758,000
Loans, percentage of portfolio	20.80%	23.40%
Loans, percentage of change in loans	2.00%
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 469,433,000	$ 410,977,000
Loans, percentage of portfolio	32.90%	33.00%
Loans, percentage of change in loans	14.20%
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Retail Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 38,968,000	$ 36,058,000
Loans, percentage of portfolio	2.70%	2.90%
Loans, percentage of change in loans	8.10%
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 38,968,000	$ 36,058,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 498,043,000	$ 562,114,000
Loans, percentage of portfolio	67.10%	66.60%
Loans, percentage of change in loans	(11.40%)
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 134,633,000	$ 166,037,000
Loans, percentage of portfolio	18.10%	19.70%
Loans, percentage of change in loans	(18.90%)
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 18,769,000	$ 22,148,000
Loans, percentage of portfolio	2.50%	2.60%
Loans, percentage of change in loans	(15.30%)
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 124,660,000	$ 138,630,000
Loans, percentage of portfolio	16.80%	16.40%
Loans, percentage of change in loans	(10.10%)
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 134,291,000	$ 148,597,000
Loans, percentage of portfolio	18.10%	17.60%
Loans, percentage of change in loans	(9.60%)
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 85,690,000	$ 86,702,000
Loans, percentage of portfolio	11.60%	10.30%
Loans, percentage of change in loans	(1.20%)
Retail Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 351,401,000	$ 373,974,000
Loans, percentage of portfolio	16.20%	17.90%
Loans, percentage of change in loans	(6.00%)
Retail Portfolio Segment [Member] | Home Equity and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 149,494,000	$ 159,278,000
Loans, percentage of portfolio	6.90%	7.60%
Loans, percentage of change in loans	(6.10%)
Retail Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 201,907,000	$ 214,696,000
Loans, percentage of portfolio	9.30%	10.30%
Loans, percentage of change in loans	(6.00%)
Retail Portfolio Segment [Member] | Originated Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 107,235,000	$ 92,927,000	$ 68,488,000
Loans, percentage of portfolio	7.50%	7.50%
Loans, percentage of change in loans	15.40%
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 60,417,000	$ 50,059,000
Loans, percentage of portfolio	4.20%	4.00%
Loans, percentage of change in loans	20.70%
Retail Portfolio Segment [Member] | Originated Loan [Member] | 1-4 Family Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 46,818,000	$ 42,868,000
Loans, percentage of portfolio	3.30%	3.50%
Loans, percentage of change in loans	9.20%
Retail Portfolio Segment [Member] | Acquired Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 244,166,000	$ 281,047,000
Loans, percentage of portfolio	32.90%	33.40%
Loans, percentage of change in loans	(13.10%)
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 89,077,000	$ 109,219,000
Loans, percentage of portfolio	12.00%	13.00%
Loans, percentage of change in loans	(18.40%)
Retail Portfolio Segment [Member] | Acquired Loan [Member] | 1-4 Family Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans (in Dollars)	$ 155,089,000	$ 171,828,000
Loans, percentage of portfolio	20.90%	20.40%
Loans, percentage of change in loans	(9.70%)