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Investment in Securities - Gross Unrealized Losses and Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Investment [Line Items]    
Bonds held-to-maturity securities, less than 12 months, unrealized (losses) $ (1,719) $ (91,935)
Bonds held-to-maturity securities, Less than 12 months, fair value 155,957 3,050,185
Bonds held-to-maturity securities, 12 months or more, unrealized (losses) (9,693) (61,833)
Bonds held-to-maturity securities, 12 months or more, fair value 476,270 1,121,340
Bonds held-to-maturity securities, total, unrealized (losses) (11,412) (153,768)
Bonds held-to-maturity securities, total, fair value 632,227 4,171,525
Bonds available-for-sale securities, less than 12 months, unrealized (losses) (1,338) (66,851)
Bonds available-for-sale securities, less than 12 months, fair value 93,296 2,519,468
Bonds available-for-sale securities, 12 months or more, unrealized (losses) (15,451) (40,493)
Bonds available-for-sale securities, 12 months or more, fair value 384,415 661,685
Bonds available-for-sale securities, total, unrealized (losses) (16,789) (107,344)
Bonds available-for-sale securities, total, fair value 477,711 3,181,153
Bonds investment in securities, less than 12 months, unrealized (losses) (3,057) (158,786)
Bonds investment in securities, less than 12 months, fair value 249,253 5,569,653
Bonds investment in securities, more than 12 months, unrealized (losses) (25,144) (102,326)
Bonds investment in securities, more than 12 months, fair value 860,685 1,783,025
Bonds investment in securities, total, unrealized (losses) (28,201) (261,112)
Bonds investment in securities, total, fair value 1,109,938 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) (52) 0
Bonds held-to-maturity securities, 12 months or more, fair value 2,613 0
Bonds held-to-maturity securities, total, unrealized (losses) (52) (301)
Bonds held-to-maturity securities, total, fair value 2,613 22,605
Bonds available-for-sale securities, less than 12 months, unrealized (losses) 0 (1,274)
Bonds available-for-sale securities, less than 12 months, fair value 1,808 119,987
Bonds available-for-sale securities, 12 months or more, unrealized (losses) 0 (1,751)
Bonds available-for-sale securities, 12 months or more, fair value 0 61,992
Bonds available-for-sale securities, total, unrealized (losses) 0 (3,025)
Bonds available-for-sale securities, total, fair value 1,808 181,979
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) (44) (214)
Bonds available-for-sale securities, 12 months or more, fair value 11,124 13,478
Bonds available-for-sale securities, total, unrealized (losses) (44) (243)
Bonds available-for-sale securities, total, fair value 11,124 23,219
Corporate debt securities    
Investment [Line Items]    
Bonds held-to-maturity securities, less than 12 months, unrealized (losses) (1,661) (90,931)
Bonds held-to-maturity securities, Less than 12 months, fair value 137,818 2,969,461
Bonds held-to-maturity securities, 12 months or more, unrealized (losses) (8,919) (59,903)
Bonds held-to-maturity securities, 12 months or more, fair value 436,089 1,063,679
Bonds held-to-maturity securities, total, unrealized (losses) (10,580) (150,834)
Bonds held-to-maturity securities, total, fair value 573,907 4,033,140
Bonds available-for-sale securities, less than 12 months, unrealized (losses) (1,338) (65,492)
Bonds available-for-sale securities, less than 12 months, fair value 91,488 2,383,548
Bonds available-for-sale securities, 12 months or more, unrealized (losses) (15,238) (38,081)
Bonds available-for-sale securities, 12 months or more, fair value 371,471 572,600
Bonds available-for-sale securities, total, unrealized (losses) (16,576) (103,573)
Bonds available-for-sale securities, total, fair value 462,959 2,956,148
Residential mortgage-backed securities    
Investment [Line Items]    
Bonds held-to-maturity securities, less than 12 months, unrealized (losses) (19) (703)
Bonds held-to-maturity securities, Less than 12 months, fair value 7,368 58,119
Bonds held-to-maturity securities, 12 months or more, unrealized (losses) (718) (1,930)
Bonds held-to-maturity securities, 12 months or more, fair value 36,651 57,661
Bonds held-to-maturity securities, total, unrealized (losses) (737) (2,633)
Bonds held-to-maturity securities, total, fair value 44,019 115,780
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) (169) (443)
Bonds available-for-sale securities, 12 months or more, fair value 1,820 13,515
Bonds available-for-sale securities, total, unrealized (losses) (169) (497)
Bonds available-for-sale securities, total, fair value 1,820 19,549
Collateralized debt securities    
Investment [Line Items]    
Bonds held-to-maturity securities, less than 12 months, unrealized (losses) (39)  
Bonds held-to-maturity securities, Less than 12 months, fair value 10,771  
Bonds held-to-maturity securities, 12 months or more, unrealized (losses) (4)  
Bonds held-to-maturity securities, 12 months or more, fair value 917  
Bonds held-to-maturity securities, total, unrealized (losses) (43) 0
Bonds held-to-maturity securities, total, fair value $ 11,688  
Bonds available-for-sale securities, less than 12 months, unrealized (losses)   (2)
Bonds available-for-sale securities, less than 12 months, fair value   158
Bonds available-for-sale securities, 12 months or more, unrealized (losses)   (4)
Bonds available-for-sale securities, 12 months or more, fair value   100
Bonds available-for-sale securities, total, unrealized (losses)   (6)
Bonds available-for-sale securities, total, fair value   $ 258