Note 5 - Loans (Detail) - Average Balance And Interest Income Recognized Related To Impaired Loans (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Impaired Loans - Average Recorded Investment	$ 277,776	$ 361,353
Impaired Loans - Interest Income Recognized	9,305	5,330
Commercial Loans Member
Impaired Loans - Average Recorded Investment	31,798	48,349
Impaired Loans - Interest Income Recognized	580	1,053
Real Estate Construction Loans [Member]
Impaired Loans - Average Recorded Investment	49,094	82,529
Impaired Loans - Interest Income Recognized	265	940
Commercial Mortgage Loans [Member]
Impaired Loans - Average Recorded Investment	178,822	212,555
Impaired Loans - Interest Income Recognized	8,221	3,101
Residential Mortgage And Equity Lines Member
Impaired Loans - Average Recorded Investment	18,062	17,920
Impaired Loans - Interest Income Recognized	$ 239	$ 236