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Note 7 - Loans (Details) - Components of Loans in Consolidated Balance Sheets - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Type of Loans:    
Loans $ 9,502,008,000 $ 8,914,080,000
Less:    
Allowance for loan losses (153,437,000) (161,420,000)
Unamortized deferred loan fees (10,207,000) (12,392,000)
Total loans, net 9,338,364,000 8,740,268,000
Loans held for sale 0 973,000
Commercial Portfolio Segment [Member]    
Type of Loans:    
Loans 2,387,450,000 2,382,493,000
Less:    
Allowance for loan losses (47,540,000) (47,501,000)
Residential Portfolio Segment [Member]    
Type of Loans:    
Loans 1,713,312,000 1,570,059,000
Commercial Real Estate Portfolio Segment [Member]    
Type of Loans:    
Loans 4,849,381,000 4,486,443,000
Less:    
Allowance for loan losses (67,245,000) (74,673,000)
Equity Lines Portfolio Segment [Member]    
Type of Loans:    
Loans 176,067,000 172,879,000
Real Estate Construction Portfolio Segment [Member]    
Type of Loans:    
Loans 370,828,000 298,654,000
Less:    
Allowance for loan losses (26,304,000) (27,652,000)
Consumer Portfolio Segment [Member]    
Type of Loans:    
Loans 4,970,000 3,552,000
Less:    
Allowance for loan losses $ (25,000) $ (16,000)