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Note 7 - Investment Securities (Details Textual) - USD ($)
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Available-for-sale Securities $ 1,368,487,000   $ 1,314,345,000
Proceeds from Sale of Mortgage Backed Securities (MBS) categorized as Available-for-sale 0 $ 415,300,000  
Proceeds from Maturities, Prepayments and Calls of Mortgage Backed Securities (MBS) 48,500,000 125,300,000  
Proceeds From Sales And Repayments Of Other Investment Securities 99,500,000 0  
Proceeds from Maturities Repayments and Calls of Other Investment Securities 341,300,000 460,000,000  
Realized Loss From Sale And Call Of Investment Securities 439,000    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities 0 $ 206,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 9,300,000   14,968,000
Pledged Investment Securities $ 291,400,000   $ 649,100,000