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Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net gain on sales of securities $ 5,409  
Income tax expense (30,988) $ (37,925)
Net income 97,577 $ 106,552
Reclassifications, net of tax [1] 2,109  
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] (2,540)  
Amortization of defined benefit pension    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, before tax [1] (2,478)  
Tax benefit [1] 695  
Reclassifications, net of tax [1] (1,783)  
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized gains on available for sale securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net gain on sales of securities [1] 5,409  
Income tax expense [1] (1,517)  
Net income [1] $ 3,892  
[1] Amounts in parentheses indicate expense items.
[2] See Note 8, “Pension and Other Post-Retirement Benefits,” for additional information.