Note 4 - Loans and Allowance for Credit Losses (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Loans and Leases Receivable, Deferred Income	$ 10,900,000		$ 10,900,000		$ 8,800,000
Servicing Asset at Fair Value, Amount	51,000,000		51,000,000		41,200,000
Interest Rate Adjustment Frequency	5 years		5 years
Stress Test Assumption Increase Interest Rates (in Basis Points)	2.00%		2.00%
Financing Receivable, Net	2,796,840,000		2,796,840,000		2,493,095,000
	100.00%	100.00%	100.00%	100.00%	100.00%
Impaired Financing Receivable, Recorded Investment	37,524,000	41,206,000	37,524,000	41,206,000	45,997,000
Impaired Financing Receivable, Unpaid Principal Balance	37,824,000	41,206,000	37,824,000	41,206,000	48,322,000
Interest and Fee Income, Loans and Leases	37,457,000	34,805,000	109,479,000	98,161,000
Financing Receivable, Modifications, Number of Contracts			9		8
Commercial Real Estate and Real Estate Construction Loans [Member] | Maximum [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Minimum Debt Service Coverage (in Basis Points)	0.0115%		0.0115%
Commercial Real Estate and Real Estate Construction Loans [Member] | Minimum [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Minimum Debt Service Coverage (in Basis Points)	0.01%		0.01%
Commercial permanent Loans [Member] | Maximum [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Minimum Debt Service Coverage (in Basis Points)	0.0115%		0.0115%
Commercial permanent Loans [Member] | Minimum [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Minimum Debt Service Coverage (in Basis Points)	0.01%		0.01%
Nonaccrual Loans [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Interest and Fee Income, Loans and Leases	102,000
Nonaccrual Loans Current and in Accordance with Original Terms [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Interest and Fee Income, Loans and Leases	582,000		1,400,000
Three TDR [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Modifications, Recorded Investment	6,100,000		6,100,000
Modified in 3 Months Ended 2013 [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Modifications, Number of Contracts	1
Modified in 9 Months Ended 2013 [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Modifications, Number of Contracts			1
Modified in 3 Months Ended 2012 [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Modifications, Number of Contracts		0
Modified in 9 Months Ended 2012 [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Modifications, Number of Contracts				0
Commercial Real Estate Owner Occupied [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Percent Of Loan Portfolio	13.00%		13.00%
Financing Receivable, Net	334,078,000		334,078,000		297,857,000
Impaired Financing Receivable, Recorded Investment	6,426,000	2,374,000	6,426,000	2,374,000	6,659,000
Impaired Financing Receivable, Unpaid Principal Balance	6,426,000	2,374,000	6,426,000	2,374,000	6,659,000
Financing Receivable, Modifications, Number of Contracts			1		1
Commercial Real Estate and Real Estate Construction Loans [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Percent Of Loan Portfolio	68.00%		68.00%
Excluding Owner Occupied Commercial Real Estate And Commercial Construction Loans [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Percent Of Loan Portfolio	55.00%		55.00%
Commercial Loan [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Percent Of Loan Portfolio	25.00%		25.00%
Length Of Loan	10 years		10 years
Financing Receivable, Net	682,413,000		682,413,000		545,070,000
Impaired Financing Receivable, Recorded Investment	9,607,000	7,282,000	9,607,000	7,282,000	9,248,000
Impaired Financing Receivable, Unpaid Principal Balance	9,607,000	7,282,000	9,607,000	7,282,000	9,461,000
Financing Receivable, Modifications, Number of Contracts			3		3
SBA Loans [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Percent Of Loan Portfolio	2.00%		2.00%
Home Equity Line of Credit [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Percent Of Loan Portfolio	4.00%		4.00%
Financing Receivable, Net	108,889,000		108,889,000		106,844,000
Impaired Financing Receivable, Recorded Investment	511,000	670,000	511,000	670,000	513,000
Impaired Financing Receivable, Unpaid Principal Balance	511,000	670,000	511,000	670,000	513,000
Residential Mortgage Loan Long-Term [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Percent Of Loan Portfolio	3.00%		3.00%
Length Of Loan	10 years		10 years
Commercial Land Acquisition Loans [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Length Of Loan	24 months		24 months
ADC Loans [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Net	543,300,000		543,300,000
	43.00%		43.00%
Construction Loans [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Length Of Loan	36 months		36 months
Financing Receivable, Net	543,265,000		543,265,000		562,530,000
Impaired Financing Receivable, Recorded Investment	13,576,000	24,371,000	13,576,000	24,371,000	23,235,000
Impaired Financing Receivable, Unpaid Principal Balance	13,876,000	24,371,000	13,876,000	24,371,000	25,347,000
Nonperforming Financing Receivable [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Impaired Financing Receivable, Recorded Investment	2,000,000		2,000,000
Impaired Financing Receivable, Unpaid Principal Balance	11,600,000		11,600,000
Performing Financing Receivable [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 10,000,000	$ 8,800,000	$ 10,000,000	$ 8,800,000	$ 15,300,000
Maximum [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Loan To Value Ratio	80.00%		80.00%
Length Of Loan	7 years		7 years
Amortization Term			25 years
Minimum [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Length Of Loan	5 years		5 years