Note 14 - Commitments and Contingencies (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments To Extend Credit	$ 1,700,000,000
CommitmentsToFundFixedRateLoans	115,400,000
Commitments To Fund Adjustable Rate Loans	1,600,000,000
Operating Lease Lease Term Minimum	1 year
Operating Lease Lease Term Maximum	50 years
Operating Leases, Rent Expense	7,400,000	6,700,000	6,600,000
Operating Leases, Income Statement, Sublease Revenue	$ 300,000	$ 200,000	$ 300,000