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Note 4 - Debt and Equity Securities (Details) (USD $)
 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Note 4 - Debt and Equity Securities (Details) [Line Items]    
Private Issue Collateralized Mortgage Obligations, Number 3  
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure (in Dollars) $ 770,545,000 $ 756,156,000
Texas Ratio, Minimum Review Threshold 50.00%  
Corporate Debt Securities [Member]
    
Note 4 - Debt and Equity Securities (Details) [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 6  
Municipal [Member]
    
Note 4 - Debt and Equity Securities (Details) [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 13  
Trust Preferred Securities [Member] | Single Issuer [Member]
    
Note 4 - Debt and Equity Securities (Details) [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1  
Trust Preferred Securities [Member] | Pooled Issuer [Member]
    
Note 4 - Debt and Equity Securities (Details) [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 2  
Trust Preferred Securities [Member]
    
Note 4 - Debt and Equity Securities (Details) [Line Items]    
Number Of Instruments Below Investment Grade 4  
Number Of Instruments Carried Under Fair Value Option Below Investment Grade 1  
Number Of Instruments Below Investment Grade Evalatued For Default 3  
To Prepay in the Third Quarter of 2014 [Member]
    
Note 4 - Debt and Equity Securities (Details) [Line Items]    
Number Of Pooled Trust Securities Assumed To Prepay 1  
SignificantAssumptionsAmountOfPrepaymentsPreferredSecurities (in Dollars) 13,300,000  
To Prepay in the Second Quarter of 2015 [Member]
    
Note 4 - Debt and Equity Securities (Details) [Line Items]    
Number Of Pooled Trust Securities Assumed To Prepay 2  
To Prepay In The Second Quarter of 2015 [Member]
    
Note 4 - Debt and Equity Securities (Details) [Line Items]    
SignificantAssumptionsAmountOfPrepaymentsPreferredSecurities (in Dollars) 21,500,000  
Pooled Trust Preferred Securities [Member]
    
Note 4 - Debt and Equity Securities (Details) [Line Items]    
Number Of Instruments With OTTI Charges Recorded 2  
Collateralized By Commercial Real Estate [Member] | Collateralized Mortgage Obligations [Member]
    
Note 4 - Debt and Equity Securities (Details) [Line Items]    
Mortgage Backed Securities Available For Sale, Amortized Cost (in Dollars) 12,500,000 13,900,000
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure (in Dollars) 12,600,000  
Collateralized By Commercial Real Estate [Member]
    
Note 4 - Debt and Equity Securities (Details) [Line Items]    
Private Issue Collateralized Mortgage Obligations, Number   3
GNMA [Member]
    
Note 4 - Debt and Equity Securities (Details) [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1  
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) 0  
FNMA [Member]
    
Note 4 - Debt and Equity Securities (Details) [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 13  
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) 0  
FHLMC [Member]
    
Note 4 - Debt and Equity Securities (Details) [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 2  
FHLMC [Member] | REMIC And CMO [Member]
    
Note 4 - Debt and Equity Securities (Details) [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 10  
FNMA [Member] | REMIC And CMO [Member]
    
Note 4 - Debt and Equity Securities (Details) [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 16  
GNMA [Member] | REMIC And CMO [Member]
    
Note 4 - Debt and Equity Securities (Details) [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 4  
Private Issue CMO [Member] | REMIC And CMO [Member]
    
Note 4 - Debt and Equity Securities (Details) [Line Items]    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) $ 0