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Note 4 - Debt and Equity Securities (Details) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 6 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 6 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
Collateralized Mortgage Obligations [Member]
Collateralized By Commercial Real Estate [Member]
Dec. 31, 2012
Collateralized Mortgage Obligations [Member]
Collateralized By Commercial Real Estate [Member]
Sep. 30, 2012
Collateralized Mortgage Obligations [Member]
Sep. 30, 2013
Collateralized Mortgage Obligations [Member]
Sep. 30, 2012
Collateralized Mortgage Obligations [Member]
Sep. 30, 2013
REMIC And CMO [Member]
Private Issue CMO [Member]
Sep. 30, 2013
REMIC And CMO [Member]
Sep. 30, 2013
REMIC And CMO [Member]
FHLMC [Member]
Sep. 30, 2013
REMIC And CMO [Member]
FNMA [Member]
Sep. 30, 2013
REMIC And CMO [Member]
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Sep. 30, 2013
REMIC And CMO [Member]
Private Issue CMO [Member]
Sep. 30, 2013
Second 12 Months [Member]
Minimum [Member]
Jun. 30, 2013
OTTI Calculation, Significant Assumptions [Member]
Minimum [Member]
Jun. 30, 2013
OTTI Calculation, Significant Assumptions [Member]
Maximum [Member]
Sep. 30, 2013
Private Issue CMO [Member]
Sep. 30, 2013
GNMA [Member]
Sep. 30, 2013
FNMA [Member]
Sep. 30, 2013
FHLMC [Member]
Sep. 30, 2013
Corporate Debt Securities [Member]
Sep. 30, 2013
Corporate Debt Securities [Member]
Sep. 30, 2013
Single Issuer [Member]
Pooled Trust Preferred Securities [Member]
Sep. 30, 2013
To Prepay In The Second Quarter of 2015 [Member]
Sep. 30, 2013
For the three months ended [Member]
Private Issue CMO [Member]
Sep. 30, 2013
OTTI Calculation, Significant Assumptions [Member]
Minimum [Member]
Sep. 30, 2013
OTTI Calculation, Significant Assumptions [Member]
Maximum [Member]
Sep. 30, 2013
First 12 Months [Member]
Minimum [Member]
Sep. 30, 2013
First 12 Months [Member]
Maximum [Member]
Jun. 30, 2013
Second 12 Months [Member]
Minimum [Member]
Sep. 30, 2013
Second 12 Months [Member]
Maximum [Member]
Sep. 30, 2013
Next Six Months [Member]
Minimum [Member]
Sep. 30, 2013
Next Six Months [Member]
Maximum [Member]
Sep. 30, 2013
Second Six Months [Member]
Maximum [Member]
Sep. 30, 2013
Third 12 Months [Member]
Sep. 30, 2013
Third 12 Months [Member]
Maximum [Member]
Sep. 30, 2013
Thereafter [Member]
Minimum [Member]
Sep. 30, 2013
Single Issuer [Member]
Trust Preferred Securities [Member]
Sep. 30, 2013
Pooled Issuer [Member]
Trust Preferred Securities [Member]
Sep. 30, 2013
Corporate Debt Securities [Member]
Sep. 30, 2013
Municipal [Member]
Sep. 30, 2013
Trust Preferred Securities [Member]
Sep. 30, 2013
Pooled Trust Preferred Securities [Member]
Sep. 30, 2013
Private Issue CMO [Member]
Dec. 31, 2012
Collateralized By Commercial Real Estate [Member]
Sep. 30, 2013
Private Issue CMO [Member]
Sep. 30, 2013
Private Issue CMO [Member]
Note 4 - Debt and Equity Securities (Details) [Line Items]                                                                                                  
Private Issue Collateralized Mortgage Obligations, Number 3 3                                                                                         2    
Mortgage Backed Securities Available For Sale, Amortized Cost (in Dollars)         $ 14,600,000 $ 15,200,000                                                                                      
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure (in Dollars) 785,210,000 785,210,000   720,113,000 14,700,000 15,700,000                                                                                      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions                       11 15 3 6         1 14 1                                   1 2 4 27            
Texas Ratio, Minimum Review Threshold   50.00%                                                                                              
Fair Value Inputs, Probability of Default                               2.00%                 25.00%         6.00% 12.00% 2.00% 10.00% 2.00% 8.00% 6.00% 2.00% 4.00% 2.00%                    
Number Of Pooled Trust Securities Assumed To Prepay                                                   2                                              
Value Of Pooled Trust Securities Assumed To Prepay (in Dollars)                                                   21,500,000                                              
Number Of Instruments On Non Accrual Status                                                                                         1        
Number Of Instruments Below Investment Grade                                     5                                                 5          
Number Of Instruments Carried Under Fair Value Option Below Investment Grade                                                                                       2          
Number Of Instruments Below Investment Grade Evalatued For Default                                     5                                                 3          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number Performing To Their Terms                   1                                                                              
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number Not Performing To Their Terms                     4                                                                            
Underperforming Securities, Principal Loss (in Dollars)                   700,000                                                                              
Number Of Instruments With OTTI Charges Recorded                                                     3                                   2 5   4 4
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) 1,622,000 2,508,000 4,102,000                                                                                         1,600,000 2,500,000
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net (in Dollars)                                                                                               900,000 1,400,000
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent (in Dollars)                                                                                               700,000 1,100,000
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent, Available-for-sale Securities (in Dollars)                                                                                               400,000 600,000
FairValueInputDelinquencyAndForeclosureLevels                                                       7.00% 24.00%                                        
Fair Value Inputs, Loss Severity                                                       40.00% 50.00%                                        
Fair Value Inputs, Prepayment Rate                                 6.00% 10.00%                                                              
Proceeds from Sale of Available-for-sale Securities (in Dollars)                                             5,900,000                                                    
Available-for-sale Securities, Gross Realized Gains (in Dollars)             119,000 3,300,000                             100,000                                                    
Proceeds from Sale of Available-for-sale Securities, Debt (in Dollars)             6,800,000 68,500,000 6,800,000                             5,900,000                                                  
Available-for-sale Securities, Gross Realized Losses (in Dollars)             $ 23,000                                 $ 500,000