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Investment in Securities - Gross Unrealized Losses and Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Investment [Line Items]    
Bonds held-to-maturity securities, less than 12 months, unrealized (losses) $ (7,804) $ (91,935)
Bonds held-to-maturity securities, Less than 12 months, fair value 219,451 3,050,185
Bonds held-to-maturity securities, 12 months or more, unrealized (losses) (36,399) (61,833)
Bonds held-to-maturity securities, 12 months or more, fair value 1,641,573 1,121,340
Bonds held-to-maturity securities, total, unrealized (losses) (44,203) (153,768)
Bonds held-to-maturity securities, total, fair value 1,861,024 4,171,525
Bonds available-for-sale securities, less than 12 months, unrealized (losses) (2,342) (66,851)
Bonds available-for-sale securities, less than 12 months, fair value 193,639 2,519,468
Bonds available-for-sale securities, 12 months or more, unrealized (losses) (33,444) (40,493)
Bonds available-for-sale securities, 12 months or more, fair value 1,218,517 661,685
Bonds available-for-sale securities, total, unrealized (losses) (35,786) (107,344)
Bonds available-for-sale securities, total, fair value 1,412,156 3,181,153
Bonds investment in securities, less than 12 months, unrealized (losses) (10,146) (158,786)
Bonds investment in securities, less than 12 months, fair value 413,090 5,569,653
Bonds investment in securities, more than 12 months, unrealized (losses) (69,843) (102,326)
Bonds investment in securities, more than 12 months, fair value 2,860,090 1,783,025
Bonds investment in securities, total, unrealized (losses) (79,989) (261,112)
Bonds investment in securities, total, fair value 3,273,180 7,352,678
U.S. States and Political Subdivisions    
Investment [Line Items]    
Bonds held-to-maturity securities, less than 12 months, unrealized (losses) 0 (301)
Bonds held-to-maturity securities, Less than 12 months, fair value 0 22,605
Bonds held-to-maturity securities, 12 months or more, unrealized (losses) (54) 0
Bonds held-to-maturity securities, 12 months or more, fair value 2,611 0
Bonds held-to-maturity securities, total, unrealized (losses) (54) (301)
Bonds held-to-maturity securities, total, fair value 2,611 22,605
Bonds available-for-sale securities, less than 12 months, unrealized (losses) (76) (1,274)
Bonds available-for-sale securities, less than 12 months, fair value 58,357 119,987
Bonds available-for-sale securities, 12 months or more, unrealized (losses) (315) (1,751)
Bonds available-for-sale securities, 12 months or more, fair value 36,648 61,992
Bonds available-for-sale securities, total, unrealized (losses) (391) (3,025)
Bonds available-for-sale securities, total, fair value 95,005 181,979
U.S. Treasury and Government    
Investment [Line Items]    
Bonds available-for-sale securities, less than 12 months, unrealized (losses) 0 (29)
Bonds available-for-sale securities, less than 12 months, fair value 0 9,741
Bonds available-for-sale securities, 12 months or more, unrealized (losses) (147) (214)
Bonds available-for-sale securities, 12 months or more, fair value 15,603 13,478
Bonds available-for-sale securities, total, unrealized (losses) (147) (243)
Bonds available-for-sale securities, total, fair value 15,603 23,219
Corporate Debt Securities    
Investment [Line Items]    
Bonds held-to-maturity securities, less than 12 months, unrealized (losses) (7,694) (90,931)
Bonds held-to-maturity securities, Less than 12 months, fair value 202,599 2,969,461
Bonds held-to-maturity securities, 12 months or more, unrealized (losses) (34,843) (59,903)
Bonds held-to-maturity securities, 12 months or more, fair value 1,555,279 1,063,679
Bonds held-to-maturity securities, total, unrealized (losses) (42,537) (150,834)
Bonds held-to-maturity securities, total, fair value 1,757,878 4,033,140
Bonds available-for-sale securities, less than 12 months, unrealized (losses) (2,266) (65,492)
Bonds available-for-sale securities, less than 12 months, fair value 135,282 2,383,548
Bonds available-for-sale securities, 12 months or more, unrealized (losses) (32,650) (38,081)
Bonds available-for-sale securities, 12 months or more, fair value 1,152,415 572,600
Bonds available-for-sale securities, total, unrealized (losses) (34,916) (103,573)
Bonds available-for-sale securities, total, fair value 1,287,697 2,956,148
Residential Mortgage-Backed Securities    
Investment [Line Items]    
Bonds held-to-maturity securities, less than 12 months, unrealized (losses) (52) (703)
Bonds held-to-maturity securities, Less than 12 months, fair value 12,038 58,119
Bonds held-to-maturity securities, 12 months or more, unrealized (losses) (1,298) (1,930)
Bonds held-to-maturity securities, 12 months or more, fair value 50,977 57,661
Bonds held-to-maturity securities, total, unrealized (losses) (1,350) (2,633)
Bonds held-to-maturity securities, total, fair value 63,015 115,780
Bonds available-for-sale securities, less than 12 months, unrealized (losses) 0 (54)
Bonds available-for-sale securities, less than 12 months, fair value 0 6,034
Bonds available-for-sale securities, 12 months or more, unrealized (losses) (326) (443)
Bonds available-for-sale securities, 12 months or more, fair value 13,593 13,515
Bonds available-for-sale securities, total, unrealized (losses) (326) (497)
Bonds available-for-sale securities, total, fair value 13,593 19,549
Collateralized Debt Securities    
Investment [Line Items]    
Bonds held-to-maturity securities, less than 12 months, unrealized (losses) (58)  
Bonds held-to-maturity securities, Less than 12 months, fair value 4,814  
Bonds held-to-maturity securities, 12 months or more, unrealized (losses) (204)  
Bonds held-to-maturity securities, 12 months or more, fair value 32,706  
Bonds held-to-maturity securities, total, unrealized (losses) (262) 0
Bonds held-to-maturity securities, total, fair value 37,520  
Bonds available-for-sale securities, less than 12 months, unrealized (losses) 0 (2)
Bonds available-for-sale securities, less than 12 months, fair value 0 158
Bonds available-for-sale securities, 12 months or more, unrealized (losses) (6) (4)
Bonds available-for-sale securities, 12 months or more, fair value 258 100
Bonds available-for-sale securities, total, unrealized (losses) (6) (6)
Bonds available-for-sale securities, total, fair value $ 258 $ 258