Note 7 - Loans (Detail) - Activity Within the Troubled Debt Resturing 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
Accruing Troubled Debt Restructuring Member
Beginning balance	$ 143,233	$ 135,327	$ 120,016	$ 136,800
New restructurings	17,047	263	38,759	13,999
Restructured loans restored to accrual status		1,037	2,853	1,037
Charge-offs		(659)		(659)
Payments	(1,207)	(2,414)	(2,555)	(4,074)
Restructured loans placed on nonaccrual	(5,824)	(17,226)	(5,824)	(30,042)
Expiration of loan concession				(733)
Ending balance	153,249	116,328	153,249	116,328
Non Accruing Troubled Debt Restructuring Member
Beginning balance	21,543	43,130	50,870	28,147
New restructurings	733		5,971	3,556
Restructured loans restored to accrual status		(1,037)	(2,853)	(1,037)
Charge-offs	(267)	(3,725)	(4,285)	(4,829)
Payments	(4,548)	(10,118)	(32,242)	(10,403)
Foreclosures		(7,245)		(7,245)
Restructured loans placed on nonaccrual	5,824	17,225	5,824	30,041
Ending balance	$ 23,285	$ 38,230	$ 23,285	$ 38,230