XML 49 R39.htm IDEA: XBRL DOCUMENT v3.7.0.1
Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net gain on sales of securities $ 1,979 $ 163
Income tax (benefit) expense (60,197) (74,922)
Net income 103,957 $ 129,909
Reclassifications, net of tax [1] (123)  
Past service liability    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, before tax [1],[2] 62  
Actuarial losses    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, before tax [1],[2] (2,121)  
Amortization of defined benefit pension    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, before tax [1] (2,059)  
Tax benefit [1] 858  
Reclassifications, net of tax [1] (1,201)  
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gains on available for sale securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net gain on sales of securities [1] 1,848  
Income tax (benefit) expense [1] (770)  
Net income [1] $ 1,078  
[1] Amounts in parentheses indicate expense items.
[2] See Note 9, "Pension and Other Post-Retirement Benefits," for additional information.