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Comprehensive income
6 Months Ended
Jun. 30, 2011
Comprehensive income [Abstract]  
Comprehensive income
9. Comprehensive income
The following table displays the components of other comprehensive income (loss):
                         
    Six months ended June 30, 2011  
    Before-tax     Income        
    amount     taxes     Net  
            (in thousands)          
Unrealized gains (losses) on investment securities:
                       
 
                       
Available-for-sale (“AFS”) investment securities with other-than-temporary impairment (“OTTI”):
                       
 
                       
Unrealized holding losses, net
  $ (11,227 )     4,501       (6,726 )
Less: reclassification adjustment for gains realized in net income
    3,814       (1,497 )     2,317  
Less: OTTI charges recognized in net income
    (32,071 )     12,587       (19,484 )
 
                 
Net change for AFS investment securities with OTTI
    17,030       (6,589 )     10,441  
 
                 
 
                       
AFS investment securities — all other:
                       
 
                       
Unrealized holding gains, net
    77,869       (30,368 )     47,501  
Less: reclassification adjustment for gains realized in net income
    146,115       (57,257 )     88,858  
 
                 
Net change for AFS investment securities — all other
    (68,246 )     26,889       (41,357 )
 
                 
 
                       
Held-to-maturity (“HTM”) investment securities with OTTI:
                       
 
                       
Unrealized holding losses, net
    (8,500 )     3,336       (5,164 )
Less: reclassification to income of unrealized holding losses
    (12 )     5       (7 )
Less: OTTI charges recognized in net income
    (10,500 )     4,121       (6,379 )
 
                 
Net change for HTM investment securities with OTTI
    2,012       (790 )     1,222  
 
                 
 
                       
Reclassification to income of unrealized holding losses on investment securities previously transferred from AFS to HTM
    2,967       (1,165 )     1,802  
 
                 
 
                       
Net unrealized losses on investment securities
    (46,237 )     18,345       (27,892 )
 
                       
Reclassification to income for amortization of gains on terminated cash flow hedges
    (224 )     83       (141 )
 
                       
Foreign currency translation adjustment
    313       (117 )     196  
 
                       
Defined benefit plans liability adjustment
    7,058       (2,770 )     4,288  
 
                 
 
  $ (39,090 )     15,541       (23,549 )
 
                 
                         
    Six months ended June 30, 2010  
    Before-tax     Income        
    amount     taxes     Net  
            (in thousands)          
Unrealized gains (losses) on investment securities:
                       
 
                       
AFS investment securities with OTTI:
                       
 
                       
Unrealized holding losses, net
  $ (50,566 )     19,603       (30,963 )
Less: OTTI charges recognized in net income
    (49,182 )     19,017       (30,165 )
 
                 
Net change for AFS investment securities with OTTI
    (1,384 )     586       (798 )
 
                 
 
                       
AFS investment securities — all other:
                       
 
                       
Unrealized holding gains, net
    221,196       (86,386 )     134,810  
Less: reclassification adjustment for losses recognized in net income
    (135 )     39       (96 )
 
                 
Net change for AFS investment securities — all other
    221,331       (86,425 )     134,906  
 
                 
 
                       
Reclassification to income of unrealized holding losses on investment securities previously transferred from AFS to HTM
    4,374       (1,716 )     2,658  
 
                 
 
                       
Net unrealized gains on investment securities
    224,321       (87,555 )     136,766  
 
                       
Reclassification to income for amortization of gains on terminated cash flow hedges
    (224 )     83       (141 )
 
                       
Defined benefit plans liability adjustment
    3,580       (1,405 )     2,175  
 
                 
 
  $ 227,677       (88,877 )     138,800  
 
                 
                                                 
                            Foreign              
        Cash     currency     Defined        
    Investment securities     flow     translation     benefit        
    With OTTI     All other     hedges     adjustment     plans     Total  
                    (in thousands)                  
Balance — January 1, 2011
  $ (87,053 )     2,332       393             (120,892 )     (205,220 )
 
                                               
Net gain (loss) during period
    11,663       (39,555 )     (141 )     196       4,288       (23,549 )
 
                                   
 
                                               
Balance — June 30, 2011
  $ (75,390 )     (37,223 )     252       196       (116,604 )     (228,769 )
 
                                   
 
                                               
Balance — January 1, 2010
  $ (76,772 )     (142,853 )     674             (117,046 )     (335,997 )
 
                                               
Net gain (loss) during period
    (798 )     137,564       (141 )           2,175       138,800  
 
                                   
 
                                               
Balance — June 30, 2010
  $ (77,570 )     (5,289 )     533             (114,871 )     (197,197 )