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Condensed Statements of Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]      
Interest income $ 1,691,584 $ 1,683,067 $ 1,708,098
Dividends received from subsidiaries (345,000)    
Gain on sale of securities 4,054 14,029 21,036
Other income 100,333 75,746 41,800
Operating expenses 615,600 579,170 591,778
Income tax benefit 84,857 (287,669) (271,579)
Net (Loss) income (47,156) 485,397 475,547
Parent Company      
Condensed Financial Statements, Captions [Line Items]      
Interest income 1,027 715 702
Dividends received from subsidiaries 345,000 410,000 450,000
Gain on sale of securities   261  
Other income 527 520 525
Gross income 346,554 411,496 451,227
Operating expenses 48,255 42,370 38,268
Income before income tax 298,299 369,126 412,959
Income tax benefit 20,720 17,570 16,547
Income before income tax benefit and equity in (overdistributed) underdistributed earnings of subsidiaries 319,019 386,696 429,506
Equity in (overdistributed) underdistributed earnings of subsidiaries (366,175) 98,701 46,041
Net (Loss) income $ (47,156) $ 485,397 $ 475,547