Note 7 - Loans (Detail) - Average Balance And Interest Income Recognized Related To Impaired Loans (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Impaired Loans - Average Recorded Investment	$ 274,757	$ 395,287	$ 294,468	$ 396,465
Impaired Loans - Interest Income Recognized	2,030	1,449	3,474	2,877
Commercial Loans Member
Impaired Loans - Average Recorded Investment	29,970	50,379	37,556	46,204
Impaired Loans - Interest Income Recognized	32	263	62	525
Real Estate Construction Loans [Member]
Impaired Loans - Average Recorded Investment	45,775	84,787	56,115	85,402
Impaired Loans - Interest Income Recognized	111	77	221	153
Commercial Mortgage Loans [Member]
Impaired Loans - Average Recorded Investment	179,835	242,697	182,351	247,885
Impaired Loans - Interest Income Recognized	1,849	1,052	3,115	2,099
Residential Mortgage And Equity Lines Member
Impaired Loans - Average Recorded Investment	19,177	17,424	18,446	16,974
Impaired Loans - Interest Income Recognized	$ 38	$ 57	$ 76	$ 100