Note 6 - Loans and Allowance for Credit Losses (Details) - Loans (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 3,279,429	$ 2,945,158	$ 2,691,358
Percent	100.00%	100.00%	100.00%
Less: Allowance for Credit Losses	(43,552)	(40,921)	(39,640)
Net loans	3,235,877	2,904,237	2,651,718
Secured Loan [Member] | Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	726,611	694,350	636,623
Percent	22.00%	24.00%	24.00%
Secured Loan [Member] | Commercial Real Estate Investment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	1,302,479	1,119,800	1,003,723
Percent	40.00%	38.00%	37.00%
Secured Loan [Member] | Commercial Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	330,073	317,491	311,335
Percent	10.00%	11.00%	12.00%
Secured Loan [Member] | Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	123,587	90,418	78,813
Percent	4.00%	3.00%	3.00%
Secured Loan [Member] | Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	108,931	110,242	108,565
Percent	3.00%	4.00%	4.00%
Secured Loan [Member] | Consumer, Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	7,116	4,031	7,981
Secured Loan [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	642,264	574,167	515,511
Percent	20.00%	19.00%	19.00%
Secured Loan [Member] | Construction - C&I (owner occupied) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	38,368	34,659	28,807
Percent	1.00%	1.00%	1.00%
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	726,611	694,350	636,623
Less: Allowance for Credit Losses	(11,413)		(12,177)
Commercial Real Estate Investment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	1,302,479	1,119,800	1,003,723
Less: Allowance for Credit Losses	(10,745)		(9,615)
Commercial Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	330,073	317,491	311,335
Less: Allowance for Credit Losses	(3,273)		(3,024)
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	123,587	90,418	78,813
Less: Allowance for Credit Losses	(958)		(942)
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	108,931	110,242	108,565
Less: Allowance for Credit Losses	(1,331)		(1,765)
Consumer, Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	7,116	4,031	7,981
Less: Allowance for Credit Losses	(345)		(369)
Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	680,632	608,826	544,318
Less: Allowance for Credit Losses	$ (15,487)		$ (11,748)