Note 4 - Loans and Allowance for Credit Losses (Details) - Loans, Net of Unamortized Net Deferred Fees (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 3,063,975	$ 2,945,158	$ 2,548,024
Percent	100.00%	100.00%	100.00%
Less: Allowance for Credit Losses	(42,018)	(40,921)	(38,811)
Net loans	3,021,957	2,904,237	2,509,213
Secured Loan [Member] | Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	704,386	694,350	579,618
Percent	23.00%	24.00%	23.00%
Secured Loan [Member] | Commercial Real Estate Investment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	1,196,405	1,119,800	910,829
Percent	40.00%	38.00%	36.00%
Secured Loan [Member] | Commercial Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	320,994	317,491	303,561
Percent	10.00%	11.00%	12.00%
Secured Loan [Member] | Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	97,846	90,418	69,256
Percent	3.00%	3.00%	3.00%
Secured Loan [Member] | Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	108,839	110,242	108,570
Percent	4.00%	4.00%	4.00%
Secured Loan [Member] | Consumer, Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	6,058	4,031	4,117
Secured Loan [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	593,967	574,167	538,071
Percent	19.00%	19.00%	21.00%
Secured Loan [Member] | Construction - C&I (owner occupied) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	35,480	34,659	34,002
Percent	1.00%	1.00%	1.00%
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	704,386	694,350	579,618
Less: Allowance for Credit Losses	(11,420)		(11,075)
Commercial Real Estate Investment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	1,196,405	1,119,800	910,829
Less: Allowance for Credit Losses	(10,590)		(9,007)
Commercial Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	320,994	317,491	303,561
Less: Allowance for Credit Losses	(3,195)		(2,804)
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	97,846	90,418	69,256
Less: Allowance for Credit Losses	(754)		(877)
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	108,839	110,242	108,570
Less: Allowance for Credit Losses	(1,507)		(1,752)
Consumer, Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	6,058	4,031	4,117
Less: Allowance for Credit Losses	(373)		(351)
Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	629,447	608,826	572,073
Less: Allowance for Credit Losses	$ (14,179)		$ (12,945)