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Note 9 - Borrowed Funds (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Note 9 - Borrowed Funds (Details) [Line Items]    
Securities Sold under Agreements to Repurchase (in Dollars) $ 700,000,000 $ 800,000,000
Weighted Average Rate Of Securities Sold Under Agreements 3.92% 3.87%
Prepaid Security Sold Under Repurchase Agreement (in Dollars) 100,000,000 450,000,000
Rate of Prepaid Security Sold Under Repurchase Agreements 3.50% 3.79%
Prepayment Penalty Security Sold Under Agreements To Repurchase (in Dollars) 3,400,000 22,600,000
Number Of Fixed-To-Floating Security Sold Under Agreements To Repurchase 4  
Total Fixed To Floating Rate Agreements (in Dollars) 200,000,000  
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum 0.00%  
Advances from Federal Home Loan Banks (in Dollars) 636,200,000 521,200,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Weighted Average Interest Rate 0.30% 0.17%
Securities Sold Under Agreements to Repurchase Minimum [Member]
    
Note 9 - Borrowed Funds (Details) [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 1.00%  
Securities Sold Under Agreements to Repurchase Maximum Initial Rate [Member]
    
Note 9 - Borrowed Funds (Details) [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.50%  
Securities Sold under Agreements to Repurchase [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
    
Note 9 - Borrowed Funds (Details) [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 2.00%  
Securities Sold under Agreements to Repurchase [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
    
Note 9 - Borrowed Funds (Details) [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 3.40%  
Floating to Fixed Rate Agreements Totaling $300 Million [Member]
    
Note 9 - Borrowed Funds (Details) [Line Items]    
Number Of Floating-To-Fixed Rate Agreements 5  
Total Floating To Fixed Rate (in Dollars) 300,000,000  
Floating to Fixed Rate Agreements Totaling $300 Million [Member] | Minimum [Member]
    
Note 9 - Borrowed Funds (Details) [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.78%  
Floating to Fixed Rate Agreements Totaling $300 Million [Member] | Maximum [Member]
    
Note 9 - Borrowed Funds (Details) [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.07%  
Securities Sold under Agreements to Repurchase [Member]
    
Note 9 - Borrowed Funds (Details) [Line Items]    
Investment Securities Pledged As Collateral (in Dollars) 808,000,000 906,100,000
Callable Securities [Member]
    
Note 9 - Borrowed Funds (Details) [Line Items]    
Securities Sold under Agreements to Repurchase (in Dollars) $ 500,000,000  
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
    
Note 9 - Borrowed Funds (Details) [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 3.50%  
Minimum [Member]
    
Note 9 - Borrowed Funds (Details) [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 8.00%  
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
    
Note 9 - Borrowed Funds (Details) [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 3.75%