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Income Tax Expense (Benefit) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Line Items]      
Federal – current $ 89,187 $ 153,587 $ 216,182
State and local – current 22,868 26,983 20,799
Total current 112,055 180,570 236,981
Federal – deferred 13,058 3,498 18,203
State and local – deferred 10,139 17,946 26,543
Total deferred 23,197 21,444 44,746
Income tax expense reported in net income 135,252 202,014 281,727
Employee stock plans 0 0 0
Securities available-for-sale (32,162) 28,495 (2,687)
Pension liability adjustments 4,897 2,234 2,924
Non-credit portion of OTTI losses 821 13 49
Total income taxes $ 108,808 $ 232,756 $ 282,013