Note 7 - Loans (Detail) - Average Balance And Interest Income Recognized Related To Impaired Loans (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Impaired Loans - Average Recorded Investment	$ 263,967	$ 332,258	$ 284,227	$ 374,828
Impaired Loans - Interest Income Recognized	2,246	1,656	6,302	5,378
Commercial Loans Member
Impaired Loans - Average Recorded Investment	25,987	55,599	33,672	49,370
Impaired Loans - Interest Income Recognized	49	264	146	789
Real Estate Construction Loans [Member]
Impaired Loans - Average Recorded Investment	41,404	78,307	51,176	83,011
Impaired Loans - Interest Income Recognized	177	488	531	1,461
Commercial Mortgage Loans [Member]
Impaired Loans - Average Recorded Investment	178,206	180,554	180,959	225,195
Impaired Loans - Interest Income Recognized	1,971	895	5,477	3,100
Residential Mortgage And Equity Lines Member
Impaired Loans - Average Recorded Investment	18,370	17,798	18,420	17,252
Impaired Loans - Interest Income Recognized	$ 49	$ 9	$ 148	$ 28