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Note 6 - Debt and Equity Securities (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Private Issue Collateralized Mortgage Obligations, Number 2 2  
Mortgage Backed Securities Available For Sale, Amortized Cost (in Dollars) $ 687,281,000    
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure (in Dollars) 720,113,000 747,288,000  
Texas Ratio Maximum   50.00%  
Significant Assumptions, Amount of Prepayments in Five Years By Two Issuers Of Pooled Trust Preferred Securities (in Dollars) 21,500,000    
Significant Assumptions, Amount of Prepayments At Next Quarterly Payment Date By Two Issuers Of Pooled Trust Preferred Securities (in Dollars) 18,700,000    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) 3,138,000 9,365,000 7,130,000
Number Of Instruments With OTTI Charges Recorded   2  
Underperforming Securities, Principal Loss (in Dollars)   900,000  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities (in Dollars) 776,000 1,578,000 2,045,000
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent, Available-for-sale Securities (in Dollars) 2,362,000 7,787,000 5,085,000
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Available-for-sale Securities (in Dollars) 1,300,000    
Available-for-sale Securities, Gross Realized Gains (in Dollars) 200,000   500,000
Available-for-sale Securities, Gross Realized Losses (in Dollars) 100,000   500,000
Collateralized Mortgage Obligations [Member] | Private Issues [Member]
     
Number Of Instruments Below Investment Grade 5    
Number Of Instruments Below Investment Grade Evalatued For Default 5    
Collateralized Mortgage Obligations [Member] | Collateralized By Commercial Real Estate [Member]
     
Mortgage Backed Securities Available For Sale, Amortized Cost (in Dollars) 15,200,000 19,000,000  
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure (in Dollars) 15,700,000 19,200,000  
OTTI Calculation, Significant Assumptions [Member] | Minimum [Member]
     
Fair Value Input, Deliquency and Foreclosure Levels 11.00% 10.00%  
Fair Value Inputs, Loss Severity 40.00% 30.00%  
Fair Value Inputs, Prepayment Rate 6.00% 10.00%  
OTTI Calculation, Significant Assumptions [Member] | Maximum [Member]
     
Fair Value Input, Deliquency and Foreclosure Levels 18.00% 20.00%  
Fair Value Inputs, Loss Severity 50.00% 50.00%  
Fair Value Inputs, Prepayment Rate 20.00% 30.00%  
OTTI Calculation, Significant Assumptions [Member] | Minimum - First 12 Months [Member]
     
Fair Value Input, Deliquency and Foreclosure Levels 6.00%    
Fair Value Inputs, Probability of Default   5.00%  
OTTI Calculation, Significant Assumptions [Member] | Maximum - First 12 Months [Member]
     
Fair Value Inputs, Probability of Default 10.00% 12.00%  
OTTI Calculation, Significant Assumptions [Member] | Minimum - Second 12 Months [Member]
     
Fair Value Inputs, Probability of Default 2.00% 2.00%  
OTTI Calculation, Significant Assumptions [Member] | Maximum - Second 12 Months [Member]
     
Fair Value Inputs, Probability of Default 7.00% 10.00%  
OTTI Calculation, Significant Assumptions [Member] | Minimum - Third 12 Months [Member]
     
Fair Value Input, Deliquency and Foreclosure Levels 2.00%    
OTTI Calculation, Significant Assumptions [Member] | Maximum - Third 12 Months [Member]
     
Fair Value Inputs, Probability of Default 8.00%    
OTTI Calculation, Significant Assumptions [Member] | Thereafter [Member]
     
Fair Value Inputs, Probability of Default 2.00% 2.00%  
OTTI Calculation, Significant Assumptions [Member] | Minimum - 24-30 Months [Member]
     
Fair Value Inputs, Probability of Default   2.00%  
OTTI Calculation, Significant Assumptions [Member] | Maximum - 24-30 Months [Member]
     
Fair Value Inputs, Probability of Default   8.00%  
OTTI Calculation, Significant Assumptions [Member] | Minimum - 30 - 36 [Member]
     
Fair Value Inputs, Probability of Default   2.00%  
OTTI Calculation, Significant Assumptions [Member] | Maximum - 30-36 Months [Member]
     
Fair Value Inputs, Probability of Default   4.00%  
FHLMC [Member] | REMIC And CMO [Member]
     
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 3 6  
FNMA [Member] | REMIC And CMO [Member]
     
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 4 6  
Private Issues [Member] | REMIC And CMO [Member]
     
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 5 8  
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars)   1,600,000 1,100,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number Performing To Their Terms 1 6  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number Not Performing To Their Terms 4 2  
Underperforming Securities, Principal Loss (in Dollars) 1,300,000    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number Of Instruments, OTTI Charge Recorded 4   4
Private Issues [Member] | Collateralized Mortgage Obligations [Member]
     
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) 3,100,000 4,600,000 3,100,000
Number Of Instruments With OTTI Charges Recorded 5    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number Of Instruments, OTTI Charge Recorded 5 4 4
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities (in Dollars)   1,100,000  
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent, Available-for-sale Securities (in Dollars)   3,500,000  
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Available-for-sale Securities (in Dollars)   2,000,000  
Private Issues [Member] | Corporate Debt Securities [Member]
     
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   2  
Single Issuer [Member] | Trust Preferred Securities [Member]
     
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   1  
Pooled Issuer [Member] | Trust Preferred Securities [Member]
     
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   2  
GNMA [Member] | REMIC And CMO [Member]
     
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   7  
Municipal [Member]
     
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 4 2  
Single Issuer Trust Preferred Security [Member]
     
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1    
Pooled Trust Preferred Securities [Member]
     
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 2    
Number Of Instruments On Non Accrual Status 1    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars)     $ 1,000,000
Number Of Instruments With OTTI Charges Recorded 2   1
Issuers In Pooled Trust Securities With a Texas Ratio Below 50% [Member]
     
Cash Flows, Default Risk   0.00%  
Trust Preferred Securities [Member]
     
Number Of Instruments Below Investment Grade 6    
Number Of Instruments Carried Under Fair Value Option Below Investment Grade 2    
Number Of Instruments Below Investment Grade Evalatued For Default 4    
FNMA [Member]
     
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1