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Securities
6 Months Ended
Jun. 30, 2011
Marketable Securities [Abstract]  
Securities
(2) Securities

Trading Securities
 
The fair value and net unrealized gain (loss) included in trading securities is as follows (in thousands):
 
   
June 30, 2011
  
December 31, 2010
  
June 30, 2010
 
   
Fair Value
  
Net Unrealized Gain (Loss)
  
Fair Value
  
Net Unrealized Gain (Loss)
  
Fair Value
  
Net Unrealized Gain (Loss)
 
Obligations of the U.S. Government
 $11,825  $(37) $3,873  $(17) $12,786  $(8)
U.S. agency residential mortgage-backed securities
  22,739   9   27,271   292   26,476   151 
Municipal and other tax-exempt securities
  62,285   (249)  23,396   (214)  18,866   (15)
Other trading securities
  2,997   (13)  927   (2)  4,031   3 
Total
 $99,846  $(290) $55,467  $59  $62,159  $131 

 
Investment Securities
 
The amortized cost and fair values of investment securities are as follows (in thousands):

   
June 30,
 
   
2011
  
2010
 
         
Not Recognized in OCI1
        
Not Recognized in OCI1
 
   
Amortized
  
Fair
  
Gross Unrealized
  
Amortized
  
Fair
  
Gross Unrealized
 
   
Cost
  
Value
  
Gain
  
Loss
  
Cost
  
Value
  
Gain
  
Loss
 
                          
Municipal and other tax-exempt
 $160,870  $165,449  $4,583  $(4) $221,702  $227,301  $5,640  $(41)
Other debt securities
  188,713   203,798   15,085      131,575   136,585   5,245   (235)
Total
 $349,583  $369,247  $19,668  $(4) $353,277  $363,886  $10,885  $(276)

   
December 31, 2010
 
         
Not Recognized in OCI1
 
   
Amortized
  
Fair
  
Gross Unrealized
 
   
Cost
  
Value
  
Gain
  
Loss
 
              
Municipal and other tax-exempt
 $184,898  $188,577  $3,912  $(233)
Other debt securities
  154,655   157,528   4,505   (1,632)
Total
 $339,553  $346,105  $8,417  $(1,865)
1 Other comprehensive income
 
 
The amortized cost and fair values of investment securities at June 30, 2011, by contractual maturity, are as shown in the following table (dollars in thousands):

                  
Weighted
 
   
Less than
  
One to
  
Six to
  
Over
     
Average
 
   
One Year
  
Five Years
  
Ten Years
  
Ten Years
  
Total
  
Maturity²
 
                    
Municipal and other tax-exempt:
                  
Amortized cost
 $49,599  $81,448  $24,506  $5,317  $160,870   2.82 
Fair value
  49,937   84,499   25,547   5,466   165,449     
Nominal yield¹
  4.64   4.66   5.58   6.22   4.84     
Other debt securities:
                        
Amortized cost
  7,729   29,513   34,784   116,687   188,713   10.50 
Fair value
  7,764   30,203   36,286   129,545   203,798     
Nominal yield
  4.52   5.44   5.58   6.20   5.90     
Total fixed maturity securities:
                        
Amortized cost
 $57,328  $110,961  $59,290  $122,004  $349,583   6.97 
Fair value
  57,701   114,702   61,833   135,011   369,247     
Nominal yield
  4.62   4.87   5.58   6.20   5.41     
Total investment securities:
                        
Amortized cost
                 $349,583     
Fair value
                  369,247     
Nominal yield
                  5.41     
¹
Calculated on a taxable equivalent basis using a 39% effective tax rate.
²
Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.
 
Available for Sale Securities
 
The amortized cost and fair value of available for sale securities are as follows (in thousands):

   
June 30, 2011
 
         
Recognized in OCI1
 
   
Amortized
  
Fair
  
Gross Unrealized
    
   
Cost
  
Value
  
Gain
  
Loss
  
OTTI²
 
                 
U.S. Treasury
 $1,001  $1,003  $2  $  $ 
Municipal and other tax-exempt
  68,502   70,210   2,375   (146)  (521)
Residential mortgage-backed securities:
                    
U. S. agencies:
                    
FNMA
  5,359,939   5,524,849   166,016   (1,106)   
FHLMC
  2,447,830   2,544,684   97,575   (721)   
GNMA
  704,168   742,411   38,243       
Other
  76,971   81,845   4,874       
Total U.S. agencies
  8,588,908   8,893,789   306,708   (1,827)   
Private issue:
                    
Alt-A loans
  195,932   166,757   46   (104)  (29,117)
Jumbo-A loans
  385,371   346,465   513   (11,949)  (27,470)
Total private issue
  581,303   513,222   559   (12,053)  (56,587)
Total residential mortgage-backed securities
  9,170,211   9,407,011   307,267   (13,880)  (56,587)
Other debt securities
  5,900   5,893      (7)   
Perpetual preferred stock
  19,511   22,694   3,183       
Equity securities and mutual funds
  38,683   60,197   21,516   (2)   
Total
 $9,303,808  $9,567,008  $334,343  $(14,035) $(57,108)
¹
Other comprehensive income
²
Amounts represent unrealized loss that remains in OCI after an other-than-temporary credit loss has been recognized in income.


   
December 31, 2010
 
         
Recognized in OCI¹
 
   
Amortized
  
Fair
  
Gross Unrealized
    
   
Cost
  
Value
  
Gain
  
Loss
  
OTTI²
 
                 
Municipal and other tax-exempt
 $72,190  $72,942  $1,172  $(315) $(105)
Residential mortgage-backed securities:
                 
U. S. agencies:
                    
FNMA
  4,791,438   4,925,693   147,024   (12,769)   
FHLMC
  2,545,208   2,620,066   83,341   (8,483)   
GNMA
  765,046   801,993   37,193   (246)   
Other
  92,013   99,157   7,144       
Total U.S. agencies
  8,193,705   8,446,909   274,702   (21,498)   
Private issue:
                    
Alt-A loans
  220,332   186,674      (353)  (33,305)
Jumbo-A loans
  494,098   457,535   923   (14,067)  (23,419)
Total private issue
  714,430   644,209   923   (14,420)  (56,724)
Total residential mortgage-backed securities
  8,908,135   9,091,118   275,625   (35,918)  (56,724)
Other debt securities
  6,401   6,401          
Perpetual preferred stock
  19,511   22,114   2,603       
Equity securities and mutual funds
  29,181   43,046   14,192   (327)   
Total
 $9,035,418  $9,235,621  $293,592  $(36,560) $(56,829)
¹
Other comprehensive income
²
Amounts represent unrealized loss that remains in OCI after an other-than-temporary credit loss has been recognized in income.

   
June 30, 2010
 
         
Recognized in OCI1
 
   
Amortized
  
Fair
  
Gross Unrealized
    
   
Cost
  
Value
  
Gain
  
Loss
  
OTTI²
 
                 
Municipal and other tax-exempt
               
Residential mortgage-backed securities:
 $66,053  $66,439  $1,460  $(1,074) $ 
U. S. agencies:
                    
FNMA
  4,148,758   4,319,324   174,183   (3,617)   
FHLMC
  2,680,437   2,776,620   96,183       
GNMA
  972,348   1,011,522   40,707   (1,533)   
Other
  107,564   116,253   8,689       
Total U.S. agencies
  7,909,107   8,223,719   319,762   (5,150)   
Private issue:
                    
Alt-A loans
  230,058   176,489      (1,350)  (52,219)
Jumbo-A loans
  619,415   559,027   1,536   (27,665)  (34,259)
Total private issue
  849,473   735,516   1,536   (29,015)  (86,478)
Total residential mortgage-backed securities
  8,758,580   8,959,235   321,298   (34,165)  (86,478)
Other debt securities
  12,971   13,064   120   (27)   
Perpetual preferred stock
  19,224   19,881   790   (133)   
Equity securities and mutual funds
  33,561   47,209   14,170   (522)   
Total
 $8,890,389  $9,105,828  $337,838  $(35,921) $(86,478)
¹
Other comprehensive income
²
Amounts represent unrealized loss that remains in OCI after an other-than-temporary credit loss has been recognized in income.



The amortized cost and fair values of available for sale securities at June 30, 2011, by contractual maturity, are as shown in the following table (dollars in thousands):

                  
Weighted
 
   
Less than
  
One to
  
Six to
  
Over
     
Average
 
   
One Year
  
Five Years
  
Ten Years
  
Ten Years6
  
Total
  
Maturity5
 
U.S. Treasuries:
                  
Amortized cost
 $1,001  $  $  $  $1,001   1.84 
Fair value
  1,003            1,003     
Nominal yield¹
  0.55            0.55     
Municipal and other tax-exempt:
                        
Amortized cost
  744   6,941   12,575   48,242   68,502   19.75 
Fair value
  752   8,077   13,678   47,703   70,210     
Nominal yield¹
  3.30   4.12   4.08   0.95   1.87     
Other debt securities:
                        
Amortized cost
           5,900   5,900   32.46 
Fair value
           5,893   5,893     
Nominal yield¹
           1.71   1.71     
Total fixed maturity securities:
                        
Amortized cost
 $1,745  $6,941  $12,575  $54,142  $75,403   20.51 
Fair value
  1,755   8,077   13,678   53,596   77,106     
Nominal yield
  3.30   3.67   4.08   1.03   1.84     
Mortgage-backed securities:
                        
Amortized cost
                  9,170,211   ² 
Fair value
                  9,407,011     
Nominal yield4
                  3.79     
Equity securities and mutual funds:
                        
Amortized cost
                  58,194   ³ 
Fair value
                  82,891     
Nominal yield
                  0.69     
Total available-for-sale securities:
                        
Amortized cost
                 $9,303,808     
Fair value
                  9,567,008     
Nominal yield
                  3.76     
¹
Calculated on a taxable equivalent basis using a 39% effective tax rate.
²
The average expected lives of mortgage-backed securities were 2.92 years based upon current prepayment assumptions.
³
Primarily restricted common stock of U.S. government agencies and preferred stock of corporate issuers with no stated maturity.
4
The nominal yield on mortgage-backed securities is based upon prepayment assumptions at the purchase date. Actual yields earned may differ significantly based upon actual prepayments.
5
Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.
6
Nominal yield on municipal and other tax-exempt securities and other debt securities with contractual maturity dates over ten years are based on variable rates which generally are reset within 35 days.

Sales of available for sale securities resulted in gains and losses as follows (in thousands):

   
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
   
2011
  
2010
  
2011
  
2010
 
Proceeds
 $771,536  $594,990  $1,411,220  $915,138 
Gross realized gains
  6,205   8,469   17,172   13,826 
Gross realized losses
  3,654      7,809    
Related federal and state income tax expense
  904   2,778   3,454   4,576 

Gains and losses on sales of available for sale securities are recognized in the Consolidated Statement of Earnings on trade date and presented as realized in the previous table on settlement date.

In addition to securities that have been reclassified as pledged to creditors, securities with an amortized cost of $3.6 billion at June 30, 2011, $5.3 billion at December 31, 2010 and $4.8 billion at June 30, 2010 have been pledged as collateral for repurchase agreements, public and trust funds on deposit and for other purposes, as required by law.  The secured parties do not have the right to sell or re-pledge these securities.

 
Temporarily Impaired Securities as of June 30, 2011
(In thousands)
   
Number
  
Less Than 12 Months
  
12 Months or Longer
  
Total
 
   
of
  
Fair
  
Unrealized
  
Fair
  
Unrealized
  
Fair
  
Unrealized
 
   
Securities
  
Value
  
Loss
  
Value
  
Loss
  
Value
  
Loss
 
Investment:
                     
Municipal and other tax exempt
  2  $619  $4  $  $  $619  $4 
                              
Available for sale:
                            
Municipal and other tax-exempt1
  51   24,065   301   19,593   366   43,658   667 
Residential mortgage-backed securities:
                            
U. S. agencies:
                            
FNMA
  7   230,949   1,106         230,949   1,106 
FHLMC
  2   98,169   721         98,169   721 
Total U.S. agencies
  9   329,118   1,827         329,118   1,827 
Private issue1:
                            
Alt-A loans
  20         156,796   29,221   156,796   29,221 
Jumbo-A loans
  39         301,397   39,419   301,397   39,419 
Total private issue
  59         458,193   68,640   458,193   68,640 
Total residential mortgage-backed securities
  68   329,118   1,827   458,193   68,640   787,311   70,467 
Other debt securities
  2         993   7   993   7 
Equity securities and mutual funds
  1   213   2         213   2 
Total available for sale
  122   353,396   2,130   478,779   69,013   832,175   71,143 
Total
  124  $354,015  $2,134  $478,779  $69,013  $832,794  $71,147 
¹
Includes the following securities for which an unrealized loss remains in OCI after an other-than-temporary credit loss has been recognized in income:
Municipal and other tax-exempt
  21  $6,948  $244  $7,115  $277  $14,063  $521 
Alt-A loans
  19         153,632   29,117   153,632   29,117 
Jumbo-A loans
  21         138,205   27,470   138,205   27,470 


Temporarily Impaired Securities as of December 31, 2010
(In thousands)
   
Number
  
Less Than 12 Months
  
12 Months or Longer
  
Total
 
   
of
  
Fair
  
Unrealized
  
Fair
  
Unrealized
  
Fair
  
Unrealized
 
   
Securities
  
Value
  
Loss
  
Value
  
Loss
  
Value
  
Loss
 
Investment:
                     
Municipal and other tax- exempt
  37  $12,482  $211  $786  $22  $13,268  $233 
Other
  15   80,698   1,632         80,698   1,632 
Total investment
  52   93,180   1,843   786   22   93,966   1,865 
                              
Available for sale:
                            
Municipal and other tax-exempt1
  42   22,271   171   25,235   249   47,506   420 
Residential mortgage-backed securities:
                            
U. S. agencies:
                            
FNMA
  26   1,099,710   12,769         1,099,710   12,769 
FHLMC
  12   491,776   8,483         491,776   8,483 
GNMA
  3   5,681   246         5,681   246 
Total U.S. agencies
  41   1,597,167   21,498         1,597,167   21,498 
Private issue1:
                            
Alt-A loans
  22         186,675   33,658   186,675   33,658 
Jumbo-A loans
  53         417,917   37,486   417,917   37,486 
Total private issue
  75         604,592   71,144   604,592   71,144 
Total residential mortgage-backed securities
  116   1,597,167   21,498   604,592   71,144   2,201,759   92,642 
Equity securities and mutual funds
  2         2,878   327   2,878   327 
Total available for sale
  160   1,619,438   21,669   632,705   71,720   2,252,143   93,389 
Total
  212  $1,712,618  $23,512  $633,491  $71,742  $2,346,109  $95,254 
¹
Includes the following securities for which an unrealized loss remains in OCI after an other-than-temporary credit loss has been recognized in income:
Municipal and other tax-exempt
  11  $10,713  $105  $  $  $10,713  $105 
Alt-A loans
  19         172,153   33,305   172,153   33,305 
Jumbo-A loans
  25         166,401   23,419   166,401   23,419 


Temporarily Impaired Securities as of June 30, 2010
(In thousands)
   
Number
  
Less Than 12 Months
  
12 Months or Longer
  
Total
 
   
of
  
Fair
  
Unrealized
  
Fair
  
Unrealized
  
Fair
  
Unrealized
 
   
Securities
  
Value
  
Loss
  
Value
  
Loss
  
Value
  
Loss
 
Investment:
                     
Municipal and other tax exempt
  13  $5,606  $31  $1,437  $10  $7,043  $41 
Other debt securities
  1   14,215   235         14,215   235 
                              
Available for sale:
                            
Municipal and other tax-exempt
  23   32,325   1,074         32,325   1,074 
Residential mortgage-backed securities:
                            
U. S. agencies:
                            
FNMA
  6   166,825   3,617         166,825   3,617 
GNMA
  2   45,693   1,533         45,693   1,533 
Total U.S. agencies
  8   212,518   5,150         212,518   5,150 
Private issue1:
                            
Alt-A loans
  20         176,489   53,569   176,489   53,569 
Jumbo-A loans
  55         480,782   61,924   480,782   61,924 
Total private issue
  75         657,271   115,493   657,271   115,493 
Total residential mortgage-backed securities
  83   212,518   5,150   657,271   115,493   869,789   120,643 
Other debt securities
  7   4,965   27   29      4,994   27 
Equity securities and mutual funds
  3   2,681   523   3,606   132   6,287   655 
Total available for sale
  116   252,489   6,774   660,906   115,625   913,395   122,399 
Total
  130  $272,310  $7,040  $662,343  $115,635  $934,653  $122,675 
¹
Includes the following securities for which an unrealized loss remains in OCI after an other-than-temporary credit loss has been recognized in income:
Alt-A loans
  16   $   $   $153,012   $52,219   $153,012   $52,219 
Jumbo-A loans
  25         160,872   34,259   160,872   34,259 

On a quarterly basis, the Company performs separate evaluations of impaired debt and equity investment and available for sale securities to determine if the unrealized losses are temporary.
 
For debt securities, management determines whether it intends to sell or if it is more-likely-than-not that it will be required to sell impaired securities.  This determination considers current and forecasted liquidity requirements, regulatory and capital requirements and securities portfolio management.  Based on this evaluation as of June 30, 2011, we do not intend to sell any impaired available for sale securities before fair value recovers to our current amortized cost and it is more-likely-than-not that we will not be required to sell impaired securities before fair value recovers, which may be maturity.
 
For all impaired debt securities for which there was no intent or expected requirement to sell, the evaluation considers all available evidence to assess whether it is more likely than not that all amounts due would not be collected according to the security's contractual terms.
 
Impairment of debt securities rated investment grade by all nationally-recognized rating agencies are considered temporary unless specific contrary information is identified.  None of the debt securities rated investment grade were considered to be other-than-temporarily impaired at June 30, 2011.

At June 30, 2011, the composition of the Company's investment and available for sale securities portfolios by the lowest current credit rating assigned by any of the three nationally-recognized rating agencies is as follows (in thousands):

   
 
U.S. Govt / GSE 1
  
 
AAA - AA
  
 
A - BBB
  
 
Below Investment Grade
  
 
Not Rated
  
 
Total
 
   
Amortized
  
Fair
  
Amortized
  
Fair
  
Amortized
  
Fair
  
Amortized
  
Fair
  
Amortized
  
Fair
  
Amortized
  
Fair
 
   
Cost
  
Value
  
Cost
  
Value
  
Cost
  
Value
  
Cost
  
Value
  
Cost
  
Value
  
Cost
  
Value
 
Investment:
                                    
Municipal and other tax-exempt
 $  $  $58,023  $59,743  $29,898  $30,679  $  $  $72,949  $75,027  $160,870  $165,449 
Other debt securities
        180,334   195,332   1,350   1,350         7,029   7,116   188,713   203,798 
Total
 $  $  $238,357  $255,075  $31,248  $32,029  $  $  $79,978  $82,143  $349,583  $369,247 
                                                  
Available for Sale:
                                                
U.S. Treasury
 $1,001  $1,003  $  $  $  $  $  $  $  $  $1,001  $1,003 
Municipal and other tax-exempt
        39,996   42,024   11,941   11,986   14,584   14,063   1,981   2,137   68,502   70,210 
Residential mortgage-backed securities:
                                                
U. S. agencies:
                                                
FNMA
  5,359,939   5,524,849                           5,359,939   5,524,849 
FHLMC
  2,447,830   2,544,684                           2,447,830   2,544,684 
GNMA
  704,168   742,411                           704,168   742,411 
Other
  76,971   81,845                           76,971   81,845 
Total U.S. agencies
  8,588,908   8,893,789                           8,588,908   8,893,789 
Private issue:
                                                
Alt-A loans
        3,269   3,164   9,914   9,961   182,749   153,632         195,932   166,757 
Jumbo-A loans
        32,106   31,379   66,618   61,397   286,647   253,689         385,371   346,465 
Total private issue
        35,375   34,543   76,532   71,358   469,396   407,321         581,303   513,222 
Total residential  mortgage-backed securities
  8,588,908   8,893,789   35,375   34,543   76,532   71,358   469,396   407,321           9,170,211   9,407,011 
Other debt securities
        5,900   5,893                     5,900   5,893 
Perpetual preferred stock
              19,511   22,694               19,511   22,694 
Equity securities and mutual funds
                          38,683   60,197   38,683   60,197 
Total
 $8,589,909  $8,894,792  $81,271  $82,460  $107,984  $106,038  $483,980  $421,384  $40,664  $62,334  $9,303,808  $9,567,008 
1
U.S. government and government sponsored enterprises are not rated by the nationally-recognized rating agencies as these securities are guaranteed by agencies of the U.S. government or government-sponsored enterprises.

At June 30, 2011, approximately $469 million of the portfolio of privately issued residential mortgage-backed securities (based on amortized cost after impairment charges) was rated below investment grade by at least one of the nationally-recognized rating agencies.  The aggregate unrealized loss on these securities totaled $62 million.  Ratings by the nationally recognized rating agencies are subjective in nature and accordingly ratings can vary significantly amongst the agencies.  Limitations generally expressed by the rating agencies include statements that ratings do not predict the specific percentage default likelihood over any given period of time and that ratings do not opine on expected loss severity of an obligation should the issuer default.  As such, the impairment of securities rated below investment grade by at least one of the nationally-recognized rating agencies was evaluated to determine if we expect not to recover the entire amortized cost basis of the security.  This evaluation was based on projections of estimated cash flows based on individual loans underlying each security using current and anticipated increases in unemployment and default rates, decreases in housing prices and estimated liquidation costs at foreclosure.  The primary assumptions used in this evaluation were:
·  
Unemployment rates – increasing to 9.5% over the next 12 months, dropping to 8% over the following 21 months, and holding at 8% thereafter.
·  
Housing price depreciation – starting with current depreciated housing prices based on information derived from the Federal Housing Finance Agency (“FHFA”) data, decreasing by an additional 4% over the next twelve months and holding at that level thereafter.
·  
Estimated Liquidation Costs – held constant at 25% to 30% for Jumbo-A loans and 35% to 38% for Alt-A loans of the then-current depreciated housing price at estimated foreclosure date.
·  
Discount rates – estimated cash flows were discounted at rates that range from 2.90% to 6.25% based on our current expected yields.

We also consider the current loan-to-value ratio and remaining credit enhancement as part of the assessment of the cash flows available to recover the amortized cost of the debt securities.  Each factor is considered in the evaluation.

The Company calculates the current loan-to-value ratio for each mortgage-backed security using loan-level data.  Current loan-to-value ratio is the current outstanding loan amount divided by an estimate of the current home value.  The current home value is derived from FHFA data.  FHFA provides historical information on home price depreciation at both the Metropolitan Statistical Area and state level.  This information is matched to each loan to estimate the home price depreciation.  Data is accumulated from the loan level to determine the current loan-to-value ratio for the security as a whole.

A distribution of the amortized cost (after recognition of the other-than-temporary impairment) and fair value by current loan to value ratio for our below investment grade private label residential mortgage-backed securities is as follows (in thousands):
            
Credit Losses Recognized
 
            
Three months ended
June 30, 2011
  
Life-to-date
 
 
Current LTV Ratio
 
Number of Securities
  
Amortized Cost
  
Fair Value
  
Number of
Securities
  
Amount
  
Number of Securities
  
Amount
 
< 70 %
  5  $28,550  $26,598     $     $ 
70 < 75
                     
75 < 80
  3   38,159   35,453             
80 < 85
  2   29,636   26,927   1   255   1   3,603 
>= 85
  50   373,051   318,343   33   4,048   43   56,904 
Total
  60  $469,396  $407,321   34  $4,303   44  $60,507 

Remaining credit enhancement is the amount of credit enhancement available to absorb current projected losses within the pool of loans that support the security.  The Company acquires the benefit of credit enhancement by investing in super-senior tranches for many of our residential mortgage-backed securities.  Subordinated tranches held by other investors are specifically designed to absorb losses before the super-senior tranches which effectively doubled the typical credit support for these types of bonds.  Current projected losses consider depreciation of home prices based on FHFA data, estimated costs and additional losses to liquidate collateral and delinquency status of the individual loans underlying the security.

Based upon projected declines in expected cash flows from certain private-label residential mortgage-backed securities for which the Company had previously recognized other-than-temporary impairment charges in earnings and other comprehensive income, the Company recognized $4.3 million of additional credit loss impairments in earnings during the second quarter of 2011.  The Company also recognized a $521 thousand other-than-temporary impairment on certain below investment grade municipal securities based on an assessment of the issuer's on-going financial difficulties.  See additional discussion regarding the development of the fair value of the bonds in Note 12.

The following is a tabular roll forward of the amount of credit-related OTTI recognized on available for sale debt securities in earnings (in thousands):

   
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
   
2011
  
2010
  
2011
  
2010
 
Balance of credit-related OTTI recognized on available for sale debt, beginning of period
 $57,223  $29,367  $52,624  $25,142 
Additions for credit-related OTTI not previously recognized
  37   791   37   1,789 
Additions for increases in credit-related OTTI previously recognized when there is no intent to sell and no requirement to sell before recovery of amortized cost
  4,787   1,855   9,386   5,082 
Balance of credit-related OTTI recognized on available for sale debt securities, end of period
 $62,047  $32,013  $62,047  $32,013 
 
Mortgage Trading Securities
 
Mortgage trading securities are residential mortgage-backed securities issued by U.S. government agencies that have been designated as an economic hedge of the mortgage servicing rights and are separately identified on the balance sheet.  The Company has elected to carry these securities at fair value with changes in fair value being recognized in earnings as they occur.  Mortgage trading securities were carried at their fair value of $553 million at June 30, 2011 with a net unrealized gain of $5.7 million.  Mortgage trading securities were carried at their fair value of $428 million at December 31, 2010, with a net unrealized loss of $5.6 million and fair value of $535 million at June 30, 2010 with a net unrealized gain of $14 million.  The Company recognized a net gain of $9.9 million and $6.4 million on mortgage trading securities for the three and six months ended June 30, 2011, respectively.  The Company recognized net gains of $14.6 million and $15.1 million on mortgage trading securities for the three and six months ended June 30, 2010, respectively.