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Note 8 - Loans (Details) - Components of Loans in Consolidated Balance Sheets - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Type of Loans:    
Loans $ 10,039,932,000 $ 8,914,080,000
Less:    
Allowance for loan losses (150,076,000) (161,420,000)
Unamortized deferred loan fees (9,592,000) (12,392,000)
Total loans, net 9,880,264,000 8,740,268,000
Loans held for sale 0 973,000
Commercial Portfolio Segment [Member]    
Type of Loans:    
Loans 2,362,059,000 2,382,493,000
Less:    
Allowance for loan losses (54,877,000) (47,501,000)
Residential Portfolio Segment [Member]    
Type of Loans:    
Loans 1,816,464,000 1,570,059,000
Commercial Real Estate Portfolio Segment [Member]    
Type of Loans:    
Loans 5,275,570,000 4,486,443,000
Less:    
Allowance for loan losses (56,033,000) (74,673,000)
Equity Lines Portfolio Segment [Member]    
Type of Loans:    
Loans 174,790,000 172,879,000
Real Estate Construction Portfolio Segment [Member]    
Type of Loans:    
Loans 405,278,000 298,654,000
Less:    
Allowance for loan losses (26,466,000) (27,652,000)
Consumer Portfolio Segment [Member]    
Type of Loans:    
Loans 5,771,000 3,552,000
Less:    
Allowance for loan losses $ (23,000) $ (16,000)