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Note 9 - Securities Sold Under Agreements to Repurchase (Details) (USD $)
 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items]    
Securities Sold under Agreements to Repurchase (in Dollars) $ 950,000,000 $ 1,250,000,000
Weighted Average Rate Of Securities Sold Under Agreements 3.80% 3.84%
Average Rate Reduction on Modified Repurchase Agreements (in Basis Points)   1.68%
Prepaid Security Sold Under Repurchase Agreement (in Dollars) 300,000,000 150,000,000
Rate of Prepaid Security Sold Under Repurchase Agreements 3.97% 4.43%
Prepayment Penalty Security Sold Under Agreements To Repurchase (in Dollars) 15,700,000 9,400,000
Total Fixed To Floating Rate Agreements (in Dollars) 450,000,000  
Number Of Fixed-To-Floating Security Sold Under Agreements To Repurchase 9  
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum 0.00%  
Securities Sold Under Agreements to Repurchase Minimum [Member]
    
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 1.00%  
Securities Sold Under Agreements to Repurchase Maximum Initial Rate [Member]
    
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.50%  
Terms Modified in Current Year [Member]
    
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items]    
Securities Sold under Agreements to Repurchase (in Dollars)   200,000,000
Floating to Fixed Rate Agreements Totaling $300 Million [Member]
    
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items]    
Number Of Floating-To-Fixed Rate Agreements 5  
Total Fixed To Floating Rate Agreements (in Dollars) 300,000,000  
LIBOR Minus Hundred Basis Point LIBOR minus 200  
LIBOR Minus Three Hundred and Forty Basis Points three-month LIBOR rate minus 340  
Floating to Fixed Rate Agreements Totaling $300 Million [Member] | Minimum [Member]
    
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.78%  
Floating to Fixed Rate Agreements Totaling $300 Million [Member] | Maximum [Member]
    
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.07%  
Securities Sold under Agreements to Repurchase [Member]
    
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items]    
Investment Securities Pledged As Collateral (in Dollars) 1,100,000,000 1,400,000,000
Callable Securities [Member]
    
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items]    
Securities Sold under Agreements to Repurchase (in Dollars) $ 750,000,000  
Minimum [Member]
    
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 8.00%  
Debt Instrument, Basis Spread on Variable Rate 3.25%  
Maximum [Member]
    
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 3.75%