Note 7 - Loans (Detail) - Average Balance And Interest Income Recognized Related To Impaired Loans (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Impaired Loans - Average Recorded Investment	$ 244,248	$ 314,179
Impaired Loans - Interest Income Recognized	1,895	1,561
Commercial Loans Member
Impaired Loans - Average Recorded Investment	22,126	45,142
Impaired Loans - Interest Income Recognized	183	257
Real Estate Construction Loans [Member]
Impaired Loans - Average Recorded Investment	42,068	66,455
Impaired Loans - Interest Income Recognized	66	176
Commercial Mortgage Loans [Member]
Impaired Loans - Average Recorded Investment	162,257	184,867
Impaired Loans - Interest Income Recognized	1,562	1,088
Residential Mortgage And Equity Lines Member
Impaired Loans - Average Recorded Investment	17,797	17,715
Impaired Loans - Interest Income Recognized	$ 84	$ 40