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Note 4 - Debt and Equity Securities (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Private Issue Collateralized Mortgage Obligations, Number   2   2
Mortgage Backed Securities Available For Sale, Amortized Cost (in Dollars)   $ 692,735,000   $ 721,047,000
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure (in Dollars)   728,537,000   747,288,000
Texas Ratio, Minimum Review Threshold   50.00%    
Number Of Default Risk Instruments, Default Determined   1    
Cash Flows, Default Risk   25.00%    
Number Of Pooled Trust Securities Assumed To Prepay In Five Years   2    
Value Of Pooled Trust Securities Assumed To Prepay In Five Years (in Dollars)   21,500,000    
Number Of Pooled Trust Securities Assumed To Prepay At Their Next Quarterly Payment Date   2    
Value Of Pooled Trust Securities Assumed To Prepay At Their Next Quarterly Payment Date (in Dollars)   18,700,000    
Number Of Instruments On Non Accrual Status   1    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number Performing To Their Terms   2    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number Not Performing To Their Terms   4    
Underperforming Securities, Principal Loss (in Dollars)   900,000    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number Of Instruments, OTTI Charge Recorded   5    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) 4,816,000 4,102,000 8,999,000  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities (in Dollars) 652,000 776,000 1,578,000  
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent, Available-for-sale Securities (in Dollars) 4,164,000 3,326,000 7,421,000  
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)   1,900,000    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Significant Inputs   The portion of the above mentioned OTTI, recorded during the nine months ended September 30, 2012, that was related to credit losses was calculated using the following significant assumptions:(1) delinquency and foreclosure levels of 11%-18%; (2) projected loss severity of 40%-50%; (3) assumed default rates of 6%-10% for the first 12 months, 2%-7% for the next 12 months, 2%-8% for the next 12 months and 2% thereafter; and (4) prepayment speeds of 6%-20%.    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number Of Instruments, OTTI Charge Not Recorded   1    
Collateralized Mortgage Obligations [Member]
       
Mortgage Backed Securities Available For Sale, Amortized Cost (in Dollars)   15,800,000   19,000,000
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure (in Dollars)   16,300,000   19,200,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   6    
Number Of Instruments Below Investment Grade   15    
Number Of Instruments Carried Under Fair Value Option Below Investment Grade   5    
Number Of Instruments Below Investment Grade Evalatued For Default   10    
Number Of Instruments With OTTI Charges Recorded   6    
FHLMC [Member]
       
Mortgage Backed Securities Available For Sale, Amortized Cost (in Dollars)   24,802,000   22,556,000
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure (in Dollars)   25,643,000   23,387,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   1    
FNMA [Member]
       
Mortgage Backed Securities Available For Sale, Amortized Cost (in Dollars)   169,359,000   175,627,000
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure (in Dollars)   178,903,000   182,630,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   1    
GNMA [Member]
       
Mortgage Backed Securities Available For Sale, Amortized Cost (in Dollars)   48,653,000   62,040,000
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure (in Dollars)   $ 53,081,000   $ 67,632,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   1    
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    
Municipal [Member]
       
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   4    
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    
Number Of Instruments With OTTI Charges Recorded   2