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Investment in Securities - Gross Unrealized Losses and Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Investment [Line Items]    
Bonds held-to-maturity securities, less than 12 months, unrealized (losses) $ (4,513) $ (91,935)
Bonds held-to-maturity securities, Less than 12 months, fair value 554,274 3,050,185
Bonds held-to-maturity securities, 12 months or more, unrealized (losses) (2,377) (61,833)
Bonds held-to-maturity securities, 12 months or more, fair value 46,078 1,121,340
Bonds held-to-maturity securities, total, unrealized (losses) (6,890) (153,768)
Bonds held-to-maturity securities, total, fair value 600,352 4,171,525
Bonds available-for-sale securities, less than 12 months, unrealized (losses) (5,720) (66,851)
Bonds available-for-sale securities, less than 12 months, fair value 167,438 2,519,468
Bonds available-for-sale securities, 12 months or more, unrealized (losses) (14,417) (40,493)
Bonds available-for-sale securities, 12 months or more, fair value 223,148 661,685
Bonds available-for-sale securities, total, unrealized (losses) (20,137) (107,344)
Bonds available-for-sale securities, total, fair value 390,586 3,181,153
Bonds investment in securities, less than 12 months, unrealized (losses) (10,233) (158,786)
Bonds investment in securities, less than 12 months, fair value 721,712 5,569,653
Bonds investment in securities, more than 12 months, unrealized (losses) (16,794) (102,326)
Bonds investment in securities, more than 12 months, fair value 269,226 1,783,025
Bonds investment in securities, total, unrealized (losses) (27,027) (261,112)
Bonds investment in securities, total, fair value 990,938 7,352,678
U.S. treasury and government    
Investment [Line Items]    
Bonds available-for-sale securities, less than 12 months, unrealized (losses) (4) (29)
Bonds available-for-sale securities, less than 12 months, fair value 4,076 9,741
Bonds available-for-sale securities, 12 months or more, unrealized (losses) (22) (214)
Bonds available-for-sale securities, 12 months or more, fair value 8,280 13,478
Bonds available-for-sale securities, total, unrealized (losses) (26) (243)
Bonds available-for-sale securities, total, fair value 12,356 23,219
U.S. states and political subdivisions    
Investment [Line Items]    
Bonds held-to-maturity securities, less than 12 months, unrealized (losses)   (301)
Bonds held-to-maturity securities, Less than 12 months, fair value   22,605
Bonds held-to-maturity securities, 12 months or more, unrealized (losses)   0
Bonds held-to-maturity securities, 12 months or more, fair value   0
Bonds held-to-maturity securities, total, unrealized (losses) 0 (301)
Bonds held-to-maturity securities, total, fair value   22,605
Bonds available-for-sale securities, less than 12 months, unrealized (losses) (9) (1,274)
Bonds available-for-sale securities, less than 12 months, fair value 1,168 119,987
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) (9) (3,025)
Bonds available-for-sale securities, total, fair value 1,168 181,979
Corporate debt securities    
Investment [Line Items]    
Bonds held-to-maturity securities, less than 12 months, unrealized (losses) (4,124) (90,931)
Bonds held-to-maturity securities, Less than 12 months, fair value 462,267 2,969,461
Bonds held-to-maturity securities, 12 months or more, unrealized (losses) (1,874) (59,903)
Bonds held-to-maturity securities, 12 months or more, fair value 39,440 1,063,679
Bonds held-to-maturity securities, total, unrealized (losses) (5,998) (150,834)
Bonds held-to-maturity securities, total, fair value 501,707 4,033,140
Bonds available-for-sale securities, less than 12 months, unrealized (losses) (5,707) (65,492)
Bonds available-for-sale securities, less than 12 months, fair value 162,194 2,383,548
Bonds available-for-sale securities, 12 months or more, unrealized (losses) (14,227) (38,081)
Bonds available-for-sale securities, 12 months or more, fair value 214,102 572,600
Bonds available-for-sale securities, total, unrealized (losses) (19,934) (103,573)
Bonds available-for-sale securities, total, fair value 376,296 2,956,148
Residential mortgage-backed securities    
Investment [Line Items]    
Bonds held-to-maturity securities, less than 12 months, unrealized (losses) (126) (703)
Bonds held-to-maturity securities, Less than 12 months, fair value 54,250 58,119
Bonds held-to-maturity securities, 12 months or more, unrealized (losses) (503) (1,930)
Bonds held-to-maturity securities, 12 months or more, fair value 6,638 57,661
Bonds held-to-maturity securities, total, unrealized (losses) (629) (2,633)
Bonds held-to-maturity securities, total, fair value 60,888 115,780
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) (168) (443)
Bonds available-for-sale securities, 12 months or more, fair value 766 13,515
Bonds available-for-sale securities, total, unrealized (losses) (168) (497)
Bonds available-for-sale securities, total, fair value 766 19,549
Collateralized debt securities    
Investment [Line Items]    
Bonds held-to-maturity securities, less than 12 months, unrealized (losses) (263)  
Bonds held-to-maturity securities, Less than 12 months, fair value 37,757  
Bonds held-to-maturity securities, 12 months or more, unrealized (losses) 0  
Bonds held-to-maturity securities, 12 months or more, fair value 0  
Bonds held-to-maturity securities, total, unrealized (losses) (263) 0
Bonds held-to-maturity securities, total, fair value $ 37,757  
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