Note 4 - Loans (Detail) - Loans Sold (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2012		Dec. 31, 2010		Dec. 31, 2012 Bulk Sales of Loan Pools [Member]		Dec. 31, 2012 Mortgage Loan Sales [Member]		Dec. 31, 2012 Other Non-Performing Loans Sold [Member]		Dec. 31, 2011 Bulk Sales of Non-Accrual Loans [Member]	Dec. 31, 2010 Bulk Sales of Non-Accrual Loans [Member]		Dec. 31, 2010 Sales of Potential Problem Loans [Member]
Loan sales in 2012
Proceeds/Fair Value		$ 151,265		$ 16,540		$ 94,470		$ 52,595		$ 4,200		$ 12,362	$ 12,540		$ 4,000
Book Value		226,490		30,226		169,577		50,326		6,587		17,087	19,088		11,138
Charge-offs	(80,300)	(82,647)	[1]	(13,686)	[1]	(80,260)	[1]	0	[1]	(2,387)	[1]	(4,725)	(6,548)	[1]	(7,138)	[1]
Gains (Losses) on Sales		$ 7,422	[2]		[2]	$ 5,153	[2]	$ 2,269	[2]		[2]			[2]		[2]

[1] Amount represents charge-offs to the allowance for loan and covered loan losses at the time the loans were identified for sale.

[2] Except for mortgage loan sales, amount represents gains (losses) on sales of loans subsequent to transfer to held-for-sale and is included in other noninterest income in the Consolidated Statements of Income. Gains (losses) on mortgage loan sales are included in other service charges, commissions, and fees in the Consolidated Statements of Income.