Note 14 - Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Commitments to Extend Notional Amount	$ 2,071,766,000	$ 1,858,669,000
Commitments to Fund Fixed Rate Loans	125,800,000
Commitments to Fund Adjustable Rate Loans	1,900,000,000
Operating Lease, Lease Term Minimum	1 year
Operating Lease, Lease Term Maximum	25 years
Operating Leases, Rent Expense	8,200,000	7,700,000	7,400,000
Operating Leases, Income Statement, Sublease Revenue	$ 200,000	$ 300,000	$ 300,000