Note 7 - Loans (Detail) - Activity Within the Troubled Debt Resturing 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
Accruing Troubled Debt Restructuring Member
Beginning balance	$ 153,249	$ 116,328	$ 120,016	$ 136,800
New restructurings	14,765	43,182	53,524	57,181
Restructured loans restored to accrual status	3,957	34	6,810	1,071
Charge-offs	(251)	(1)	(251)	(660)
Payments	(1,569)	(33,273)	(4,124)	(37,347)
Restructured loans placed on nonaccrual			(5,824)	(30,042)
Expiration of loan concession				(733)
Ending balance	170,151	126,270	170,151	126,270
Non Accruing Troubled Debt Restructuring Member
Beginning balance	23,285	38,230	50,870	28,147
New restructurings	1,153	8,918	7,124	12,474
Restructured loans restored to accrual status	(3,957)	(34)	(6,810)	(1,071)
Charge-offs		(1,279)	(4,285)	(6,108)
Payments	(1,405)	(929)	(33,647)	(11,332)
Foreclosures		(832)		(8,077)
Restructured loans placed on nonaccrual		1	5,824	30,042
Ending balance	$ 19,076	$ 44,075	$ 19,076	$ 44,075