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Condensed Statements of Income (Loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]      
Interest income $ 1,689,673 $ 1,582,239 $ 1,674,869
Dividends received from subsidiaries (380,000)    
Other income 35,424 44,506 41,613
Operating expenses 546,628 641,218 638,109
Income tax benefit (135,252) (202,014) (281,727)
Net income 422,417 466,201 495,401
Parent Company      
Condensed Financial Statements, Captions [Line Items]      
Interest income 500 943 527
Dividends received from subsidiaries 380,000 336,000 330,000
Other income 793 1,700 679
Gross income 381,293 338,643 331,206
Operating expenses 59,372 54,333 49,157
Income before income tax benefit and equity in underdistributed (overdistributed) earnings of subsidiaries 321,921 284,310 282,049
Income tax benefit 16,616 19,575 19,592
Income before equity in underdistributed (overdistributed) earnings of subsidiaries 338,537 303,885 301,641
Equity in underdistributed (overdistributed) earnings of subsidiaries 83,880 162,316 193,760
Net income $ 422,417 $ 466,201 $ 495,401