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Investment in Securities - Investments in Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Investment [Line Items]    
Held-to-maturity securities, cost or amortized cost $ 8,211,449 $ 7,552,959
Held-to-maturity securities, gross unrealized gains 72,403 240,713
Held-to-maturity securities, gross unrealized (losses) (153,768) (19,319)
Held-to-maturity securities, fair value 8,130,084 7,774,353
Available-for-sale debt securities, cost or amortized cost 6,261,621 5,957,901
Available-for-sale debt securities, gross unrealized gains 61,286 204,803
Available-for-sale debt securities, gross unrealized (losses) (107,344) (17,396)
Available-for-sale debt securities, fair value 6,215,563 6,145,308
Available-for-sale equity securities, cost or amortized cost 714,504 757,583
Available-for-sale equity securities, gross unrealized gains   1,033,809
Available-for-sale equity securities, gross unrealized (losses)   (7,166)
Equity securities   1,784,226
Investments in securities, cost or amortized cost 14,473,070 14,268,443
Investments in securities, gross unrealized gains 133,689 1,479,325
Investments in securities, gross unrealized (losses) (261,112) (43,881)
Investments in securities, fair value 14,345,647 15,703,887
Preferred Stock    
Investment [Line Items]    
Available-for-sale equity securities, cost or amortized cost   19,130
Available-for-sale equity securities, gross unrealized gains   4,469
Available-for-sale equity securities, gross unrealized (losses)   0
Equity securities   23,599
Common Stock    
Investment [Line Items]    
Available-for-sale equity securities, cost or amortized cost   738,453
Available-for-sale equity securities, gross unrealized gains   1,029,340
Available-for-sale equity securities, gross unrealized (losses)   (7,166)
Equity securities   1,760,627
U.S. Treasury and Government    
Investment [Line Items]    
Available-for-sale debt securities, cost or amortized cost 28,304 27,569
Available-for-sale debt securities, gross unrealized gains 338 475
Available-for-sale debt securities, gross unrealized (losses) (243) (146)
Available-for-sale debt securities, fair value 28,399 27,898
U.S. States and Political Subdivisions    
Investment [Line Items]    
Held-to-maturity securities, cost or amortized cost 245,360 266,966
Held-to-maturity securities, gross unrealized gains 5,840 12,466
Held-to-maturity securities, gross unrealized (losses) (301) (37)
Held-to-maturity securities, fair value 250,899 279,395
Available-for-sale debt securities, cost or amortized cost 848,228 866,250
Available-for-sale debt securities, gross unrealized gains 16,827 31,621
Available-for-sale debt securities, gross unrealized (losses) (3,025) (824)
Available-for-sale debt securities, fair value 862,030 897,047
Residential Mortgage-Backed Securities    
Investment [Line Items]    
Held-to-maturity securities, cost or amortized cost 315,306 246,803
Held-to-maturity securities, gross unrealized gains 7,237 9,702
Held-to-maturity securities, gross unrealized (losses) (2,633) (1,262)
Held-to-maturity securities, fair value 319,910 255,243
Available-for-sale debt securities, cost or amortized cost 31,735 15,009
Available-for-sale debt securities, gross unrealized gains 424 37
Available-for-sale debt securities, gross unrealized (losses) (497) (329)
Available-for-sale debt securities, fair value 31,662 14,717
Collateralized Debt Securities    
Investment [Line Items]    
Held-to-maturity securities, cost or amortized cost 5,214 923
Held-to-maturity securities, gross unrealized gains 71 31
Held-to-maturity securities, gross unrealized (losses) 0 0
Held-to-maturity securities, fair value 5,285 954
Available-for-sale debt securities, cost or amortized cost 2,775 3,171
Available-for-sale debt securities, gross unrealized gains 675 651
Available-for-sale debt securities, gross unrealized (losses) (6) (4)
Available-for-sale debt securities, fair value 3,444 3,818
Other Debt Securities    
Investment [Line Items]    
Held-to-maturity securities, cost or amortized cost 717 1,792
Held-to-maturity securities, gross unrealized gains 14 49
Held-to-maturity securities, gross unrealized (losses) 0 0
Held-to-maturity securities, fair value 731 1,841
Available-for-sale debt securities, cost or amortized cost   1,994
Available-for-sale debt securities, gross unrealized gains   447
Available-for-sale debt securities, gross unrealized (losses)   0
Available-for-sale debt securities, fair value   2,441
Foreign Governments    
Investment [Line Items]    
Held-to-maturity securities, cost or amortized cost 3,961 4,011
Held-to-maturity securities, gross unrealized gains 469 582
Held-to-maturity securities, gross unrealized (losses) 0 0
Held-to-maturity securities, fair value 4,430 4,593
Available-for-sale debt securities, cost or amortized cost 5,000 5,000
Available-for-sale debt securities, gross unrealized gains 1,210 1,460
Available-for-sale debt securities, gross unrealized (losses) 0 0
Available-for-sale debt securities, fair value 6,210 6,460
Corporate Debt Securities    
Investment [Line Items]    
Held-to-maturity securities, cost or amortized cost 7,640,891 7,032,464
Held-to-maturity securities, gross unrealized gains 58,772 217,883
Held-to-maturity securities, gross unrealized (losses) (150,834) (18,020)
Held-to-maturity securities, fair value 7,548,829 7,232,327
Available-for-sale debt securities, cost or amortized cost 5,345,579 5,038,908
Available-for-sale debt securities, gross unrealized gains 41,812 170,112
Available-for-sale debt securities, gross unrealized (losses) (103,573) (16,093)
Available-for-sale debt securities, fair value $ 5,283,818 $ 5,192,927