Note 4 - Loans and Allowance for Credit Losses (Detail) - Loans, Net Of Unamortized Net Deferred Fees (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011		Sep. 30, 2011
Amount	$ 2,397,669		$ 2,056,256		$ 2,029,645
Loan Percent	100.00%		100.00%		100.00%
Less: Allowance for Credit Losses	(35,582)		(29,653)		(28,599)
Net loans	2,362,087		2,026,603		2,001,046
Commercial Loan [Member] | Secured Loan [Member]
Amount	534,133		478,886		470,103
Loan Percent	23.00%		23.00%		23.00%
Commercial Loan [Member]
Amount	534,133		478,886		470,103
Commercial Real Estate Investment [Member] | Secured Loan [Member]
Amount	942,770	[1]	756,645	[1]	772,728	[1]
Loan Percent	39.00%	[1]	37.00%	[1]	38.00%	[1]
Commercial Real Estate Investment [Member]
Amount	942,770		756,645		772,728
Commercial Real Estate Owner Occupied [Member] | Secured Loan [Member]
Amount	306,148		250,174		245,497
Loan Percent	13.00%		12.00%		12.00%
Commercial Real Estate Owner Occupied [Member]
Amount	306,148		250,174		245,497
Residential Mortgage [Member] | Secured Loan [Member]
Amount	57,952		39,552		37,662
Loan Percent	2.00%		2.00%		2.00%
Residential Mortgage [Member]
Amount	57,952		39,552		37,662
C And I Owner Occupied [Member] | Secured Loan [Member]
Amount	14,739	[1]	34,402	[1]	31,035	[1]
Loan Percent	1.00%	[1]	2.00%	[1]	2.00%	[1]
Home Equity Line of Credit [Member] | Secured Loan [Member]
Amount	98,930		97,103		94,008
Loan Percent	4.00%		5.00%		5.00%
Home Equity Line of Credit [Member]
Amount	98,930		97,103		94,008
Consumer, Other [Member] | Secured Loan [Member]
Amount	5,043		4,227		4,218
Consumer, Other [Member]
Amount	5,043		4,227		4,218
Secured Loan [Member] | Construction Loans [Member]
Amount	437,954	[1]	395,267	[1]	374,394	[1]
Loan Percent	18.00%	[1]	19.00%	[1]	18.00%	[1]
Construction Loans [Member]
Amount	$ 452,693		$ 429,669		$ 405,429

[1] Includes loans for land acquisition and development.