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Note 4 - Debt and Equity Securities (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Private Issue Collateralized Mortgage Obligations, Number 3   3    
Mortgage Backed Securities Available For Sale, Amortized Cost (in Dollars) $ 779,141,000   $ 779,141,000    
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure (in Dollars) 782,388,000   782,388,000   720,113,000
Texas Ratio, Minimum Review Threshold 50.00%        
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) 1,221,000 6,218,000 1,221,000 6,218,000  
Collateralized Mortgage Obligations [Member] | Collateralized By Commercial Real Estate [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Mortgage Backed Securities Available For Sale, Amortized Cost (in Dollars) 16,500,000   16,500,000   15,200,000
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure (in Dollars) 16,600,000   16,600,000   15,700,000
Collateralized Mortgage Obligations [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Proceeds from Sale of Available-for-sale Securities, Debt (in Dollars)     68,500,000    
Available-for-sale Securities, Gross Realized Gains (in Dollars)     3,200,000    
Available-for-sale Securities, Gross Realized Losses (in Dollars)     300,000    
REMIC And CMO [Member] | Private Issue CMO [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number Performing To Their Terms 1   1    
REMIC And CMO [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number Not Performing To Their Terms 4   4    
Underperforming Securities, Principal Loss (in Dollars)     500,000    
REMIC And CMO [Member] | FHLMC [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 10   10    
REMIC And CMO [Member] | FNMA [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 14   14    
REMIC And CMO [Member] | Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 2   2    
REMIC And CMO [Member] | Private Issue CMO [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 5   5    
Private Issue CMO [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Number Of Instruments Below Investment Grade 5   5    
Number Of Instruments Below Investment Grade Evalatued For Default 5   5    
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   1    
FNMA [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 14   14    
FHLMC [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1   1    
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        
Value Of Pooled Trust Securities Assumed To Prepay (in Dollars) 21,500,000   21,500,000    
OTTI Calculation, Significant Assumptions [Member] | Minimum [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
FairValueInputDelinquencyAndForeclosureLevels     6.00%    
Fair Value Inputs, Loss Severity     40.00%    
OTTI Calculation, Significant Assumptions [Member] | Maximum [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
FairValueInputDelinquencyAndForeclosureLevels     6.00%    
Fair Value Inputs, Loss Severity     2.00%    
First 12 Months [Member] | Minimum [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Fair Value Inputs, Probability of Default     2.00%    
First 12 Months [Member] | Maximum [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Fair Value Inputs, Probability of Default     2.00%    
Second 12 Months [Member] | Minimum [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Fair Value Inputs, Probability of Default     6.00%    
Collateralized By Commercial Real Estate [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Private Issue Collateralized Mortgage Obligations, Number         2
Single Issuer [Member] | Trust Preferred Securities [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1   1    
Pooled Issuer [Member] | Trust Preferred Securities [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 2   2    
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 5   5    
Municipal [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 25   25    
Trust Preferred Securities [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Number Of Instruments Below Investment Grade 5   5    
Number Of Instruments Carried Under Fair Value Option Below Investment Grade 2   2    
Number Of Instruments Below Investment Grade Evalatued For Default 3   3    
Pooled Trust Preferred Securities [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Number Of Instruments On Non Accrual Status 1   1    
Number Of Instruments With OTTI Charges Recorded 2   2    
Private Issue CMO [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Number Of Instruments With OTTI Charges Recorded 6   6    
Private Issue CMO [Member]
         
Note 4 - Debt and Equity Securities (Details) [Line Items]          
Number Of Instruments With OTTI Charges Recorded 4   4    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars)     1,200,000    
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net (in Dollars)     500,000    
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent (in Dollars)     700,000    
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent, Available-for-sale Securities (in Dollars)     $ 400,000