Note 4 - Loans and Allowance for Credit Losses (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Loans and Leases Receivable, Deferred Income	$ 9,900,000		$ 9,900,000		$ 8,800,000
Servicing Asset at Fair Value, Amount	53,000,000		53,000,000		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	2,691,358,000		2,691,358,000		2,493,095,000
	100.00%	100.00%	100.00%	100.00%	100.00%
Impaired Financing Receivable, Recorded Investment	38,302,000	41,659,000	38,302,000	41,659,000	45,997,000
Impaired Financing Receivable, Unpaid Principal Balance	38,302,000	41,659,000	38,302,000	41,659,000	48,322,000
Interest and Fee Income, Loans and Leases	35,998,000	32,633,000	72,022,000	63,356,000
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	0		0
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	348,000		855,000
One TDR [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Modifications, Recorded Investment	500,000		500,000
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	311,335,000		311,335,000		297,857,000
Impaired Financing Receivable, Recorded Investment	6,438,000	1,674,000	6,438,000	1,674,000	6,659,000
Impaired Financing Receivable, Unpaid Principal Balance	6,438,000	1,674,000	6,438,000	1,674,000	6,659,000
Commercial Real Estate and Real Estate Construction Loans [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Percent Of Loan Portfolio	69.00%		69.00%
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	56.00%		56.00%
Commercial Loan [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Percent Of Loan Portfolio	24.00%		24.00%
Length Of Loan	10 years		10 years
Financing Receivable, Net	636,623,000		636,623,000		545,070,000
Impaired Financing Receivable, Recorded Investment	10,760,000	5,961,000	10,760,000	5,961,000	9,248,000
Impaired Financing Receivable, Unpaid Principal Balance	10,760,000	5,961,000	10,760,000	5,961,000	9,461,000
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	108,565,000		108,565,000		106,844,000
Impaired Financing Receivable, Recorded Investment	411,000	423,000	411,000	423,000	513,000
Impaired Financing Receivable, Unpaid Principal Balance	411,000	423,000	411,000	423,000	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	535,500,000		535,500,000
	38.00%		38.00%
Construction Loans [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Length Of Loan	36 months		36 months
Financing Receivable, Net	544,318,000		544,318,000		562,530,000
Impaired Financing Receivable, Recorded Investment	14,489,000	26,988,000	14,489,000	26,988,000	23,235,000
Impaired Financing Receivable, Unpaid Principal Balance	14,489,000	26,988,000	14,489,000	26,988,000	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	11,700,000		11,700,000
Performing Financing Receivable [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 14,800,000	$ 8,800,000	$ 14,800,000	$ 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