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Condensed Statements of Income (Loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]      
Interest income $ 1,674,869 $ 1,691,584 $ 1,683,067
Dividends received from subsidiaries (330,000)    
Gain on sales of securities 3,347 4,054 14,029
Other income 41,613 74,200 75,969
Operating expenses 638,109 615,600 579,170
Income tax benefit (281,727) 84,857 (287,669)
Net (Loss) income 495,401 (47,156) 485,397
Parent Company      
Condensed Financial Statements, Captions [Line Items]      
Interest income 527 1,027 715
Dividends received from subsidiaries 330,000 345,000 410,000
Gain on sales of securities     261
Other income 679 527 520
Gross income 331,206 346,554 411,496
Operating expenses 49,157 48,255 42,370
Income before income tax benefit and equity in underdistributed (overdistributed) earnings of subsidiaries 282,049 298,299 369,126
Income tax benefit 19,592 20,720 17,570
Income before equity in underdistributed (overdistributed) earnings of subsidiaries 301,641 319,019 386,696
Equity in underdistributed (overdistributed) earnings of subsidiaries 193,760 (366,175) 98,701
Net (Loss) income $ 495,401 $ (47,156) $ 485,397