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Investment in Securities - Gross Unrealized Losses and Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Investment [Line Items]    
Bonds held-to-maturity securities, less than 12 months, unrealized (losses) $ (6,285) $ (91,935)
Bonds held-to-maturity securities, less than 12 months, fair value 679,040 3,050,185
Bonds held-to-maturity securities, 12 months or more, unrealized (losses) (1,749) (61,833)
Bonds held-to-maturity securities, 12 months or more, fair value 50,417 1,121,340
Bonds held-to-maturity securities, total, unrealized (losses) (8,034) (153,768)
Bonds held-to-maturity securities, total, fair value 729,457 4,171,525
Bonds available-for-sale securities, less than 12 months, unrealized (losses) (5,276) (66,851)
Bonds available-for-sale securities, less than 12 months, fair value 107,003 2,519,468
Bonds available-for-sale securities, 12 months or more, unrealized (losses) (7,735) (40,493)
Bonds available-for-sale securities, 12 months or more, fair value 141,647 661,685
Bonds available-for-sale securities, total, unrealized (losses) (13,011) (107,344)
Bonds available-for-sale securities, total, fair value 248,650 3,181,153
Bonds investment in securities, less than 12 months, unrealized (losses) (11,561) (158,786)
Bonds investment in securities, less than 12 months, fair value 786,043 5,569,653
Bonds investment in securities, more than 12 months, unrealized (losses) (9,484) (102,326)
Bonds investment in securities, more than 12 months, fair value 192,064 1,783,025
Bonds investment in securities, total, unrealized (losses) (21,045) (261,112)
Bonds investment in securities, total, fair value 978,107 7,352,678
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) (5) (214)
Bonds available-for-sale securities, 12 months or more, fair value 8,299 13,478
Bonds available-for-sale securities, total, unrealized (losses) (5) (243)
Bonds available-for-sale securities, total, fair value 8,299 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 1,733 119,987
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 1,733 181,979
Corporate Debt Securities    
Investment [Line Items]    
Bonds held-to-maturity securities, less than 12 months, unrealized (losses) (5,300) (90,931)
Bonds held-to-maturity securities, less than 12 months, fair value 547,329 2,969,461
Bonds held-to-maturity securities, 12 months or more, unrealized (losses) (1,239) (59,903)
Bonds held-to-maturity securities, 12 months or more, fair value 45,086 1,063,679
Bonds held-to-maturity securities, total, unrealized (losses) (6,539) (150,834)
Bonds held-to-maturity securities, total, fair value 592,415 4,033,140
Bonds available-for-sale securities, less than 12 months, unrealized (losses) (5,257) (65,492)
Bonds available-for-sale securities, less than 12 months, fair value 94,942 2,383,548
Bonds available-for-sale securities, 12 months or more, unrealized (losses) (7,538) (38,081)
Bonds available-for-sale securities, 12 months or more, fair value 132,626 572,600
Bonds available-for-sale securities, total, unrealized (losses) (12,795) (103,573)
Bonds available-for-sale securities, total, fair value 227,568 2,956,148
Residential Mortgage-Backed Securities    
Investment [Line Items]    
Bonds held-to-maturity securities, less than 12 months, unrealized (losses) (638) (703)
Bonds held-to-maturity securities, less than 12 months, fair value 86,178 58,119
Bonds held-to-maturity securities, 12 months or more, unrealized (losses) (510) (1,930)
Bonds held-to-maturity securities, 12 months or more, fair value 5,331 57,661
Bonds held-to-maturity securities, total, unrealized (losses) (1,148) (2,633)
Bonds held-to-maturity securities, total, fair value 91,509 115,780
Bonds available-for-sale securities, less than 12 months, unrealized (losses) (9) (54)
Bonds available-for-sale securities, less than 12 months, fair value 10,169 6,034
Bonds available-for-sale securities, 12 months or more, unrealized (losses) (192) (443)
Bonds available-for-sale securities, 12 months or more, fair value 722 13,515
Bonds available-for-sale securities, total, unrealized (losses) (201) (497)
Bonds available-for-sale securities, total, fair value 10,891 19,549
Collateralized Debt Securities    
Investment [Line Items]    
Bonds held-to-maturity securities, less than 12 months, unrealized (losses) (347)  
Bonds held-to-maturity securities, less than 12 months, fair value 45,533  
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) (347) 0
Bonds held-to-maturity securities, total, fair value 45,533  
Bonds available-for-sale securities, less than 12 months, unrealized (losses) (1) (2)
Bonds available-for-sale securities, less than 12 months, fair value 159 158
Bonds available-for-sale securities, 12 months or more, unrealized (losses) 0 (4)
Bonds available-for-sale securities, 12 months or more, fair value 0 100
Bonds available-for-sale securities, total, unrealized (losses) (1) (6)
Bonds available-for-sale securities, total, fair value $ 159 $ 258