XML 29 R89.htm IDEA: XBRL DOCUMENT v2.4.0.6
Fair Value (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Assets:    
Available for sale securities $ 5,525,015,000 $ 5,213,915,000
Non-financial assets:    
Other real estate owned 100,106,000 86,626,000
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3    
Charges to allowance for probable loan losses in connection with other real estate owned 10,450,000 1,100,000
Write downs in fair value in connection with other real estate owned 0 9,509,000
Significant Unobservable Inputs (Level 3)
    
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3    
Estimated future principal prepayment rate assumption, discount rate (as a percent) 13.00%  
Default rate assumptions (as a percent) 7.00%  
Loss severity rate assumptions, first year (as a percent) 60.00%  
Decrease in loss severity rates, following three years (as a percent) 10.00%  
Loss severity rate, thereafter (as a percent) 20.00%  
Significant Unobservable Inputs (Level 3) | Bond meeting the original contract terms
    
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3    
Estimated future principal prepayment rate assumption, low end of range (as a percent) 7.00%  
Estimated future principal prepayment rate assumption, discount rate (as a percent) 13.00%  
Default rate assumptions (as a percent) 1.00%  
Loss severity rate assumptions, first year (as a percent) 25.00%  
Significant Unobservable Inputs (Level 3) | Bond not meeting the original contract terms
    
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3    
Estimated future principal prepayment rate assumption, low end of range (as a percent) 2.00%  
Estimated future principal prepayment rate assumption, discount rate (as a percent) 13.00%  
Default rate assumptions (as a percent) 9.00%  
Loss severity rate assumptions, first year (as a percent) 60.00%  
Decrease in loss severity rates, following five years (as a percent) 5.00%  
Loss severity rate, thereafter (as a percent) 25.00%  
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value
    
Assets:    
Available for sale securities 5,525,015,000 5,213,915,000
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value | Residential mortgage-backed securities
    
Assets:    
Available for sale securities 5,265,204,000 4,969,263,000
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value | States and political subdivisions
    
Assets:    
Available for sale securities 238,675,000 224,761,000
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value | Other
    
Assets:    
Available for sale securities 21,136,000 19,891,000
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Assets:    
Available for sale securities 21,136,000 19,891,000
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other
    
Assets:    
Available for sale securities 21,136,000 19,891,000
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2)
    
Assets:    
Available for sale securities 5,471,019,000 5,154,419,000
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities
    
Assets:    
Available for sale securities 5,232,344,000 4,929,658,000
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) | States and political subdivisions
    
Assets:    
Available for sale securities 238,675,000 224,761,000
Measured on a recurring basis: | Significant Unobservable Inputs (Level 3)
    
Assets:    
Available for sale securities 32,860,000 39,605,000
Measured on a recurring basis: | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities
    
Assets:    
Available for sale securities 32,860,000 39,605,000
Measured on a non-recurring basis:
    
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3    
Change in provision, impaired loans 295,000 15,457,000
Change in provision, other real estate owned   9,509,000
Measured on a non-recurring basis: | Assets/Liabilities Measured at Fair Value
    
Assets:    
Impaired Loans 11,981,000 81,723,000
Non-financial assets:    
Other real estate owned 18,749,000 34,631,000
Measured on a non-recurring basis: | Significant Unobservable Inputs (Level 3)
    
Assets:    
Impaired Loans 11,981,000 81,723,000
Non-financial assets:    
Other real estate owned $ 18,749,000 $ 34,631,000
Maximum | Significant Unobservable Inputs (Level 3)
    
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3    
Estimated future principal prepayment rate assumption, low end of range (as a percent) 5.00%  
Default rate assumptions for the first year, low end of range (as a percent) 11.00%  
Minimum | Significant Unobservable Inputs (Level 3)
    
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3    
Estimated future principal prepayment rate assumption, low end of range (as a percent) 4.00%  
Default rate assumptions for the first year, low end of range (as a percent) 10.00%