XML 74 R59.htm IDEA: XBRL DOCUMENT v3.10.0.1
Investment in Securities - Gross Unrealized Losses and Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Investment [Line Items]    
Bonds held-to-maturity, less than 12 months, unrealized (losses) $ (91,935) $ (8,806)
Bonds held-to-maturity, less than 12 months, fair value 3,050,185 1,002,645
Bonds held-to-maturity, 12 months or more, unrealized (losses) (61,833) (10,513)
Bonds held-to-maturity, 12 months or more, fair value 1,121,340 211,625
Bonds held-to-maturity, total, unrealized (losses) (153,768) (19,319)
Bonds held-to-maturity, total, fair value 4,171,525 1,214,270
Available-for-sale securities, less than 12 months, unrealized (losses) (66,851) (7,151)
Available-for-sale securities, less than 12 months, fair value 2,519,468 620,150
Available-for-sale securities, 12 months or more, unrealized (losses) (40,493) (10,245)
Available-for-sale securities, 12 months or more, fair value 661,685 192,968
Available-for-sale securities, total, unrealized (losses) (107,344) (17,396)
Available-for-sale securities, total, fair value 3,181,153 813,118
Investment in securities, less than 12 months, unrealized (losses) (158,786) (23,123)
Investment in securities, less than 12 months, fair value 5,569,653 1,683,186
Investment in securities, more than 12 months, unrealized (losses) (102,326) (20,758)
Investment in securities, more than 12 months, fair value 1,783,025 404,593
Investment in securities, total, unrealized (losses) (261,112) (43,881)
Investment in securities, total, fair value 7,352,678 2,087,779
Common Stock    
Investment [Line Items]    
Available-for-sale securities, less than 12 months, unrealized (losses)   (7,166)
Available-for-sale securities, less than 12 months, fair value   60,391
Available-for-sale securities, 12 months or more, unrealized (losses)   0
Available-for-sale securities, 12 months or more, fair value   0
Available-for-sale securities, total, unrealized (losses)   (7,166)
Available-for-sale securities, total, fair value   60,391
Equity Securities    
Investment [Line Items]    
Available-for-sale securities, less than 12 months, unrealized (losses)   (7,166)
Available-for-sale securities, less than 12 months, fair value   60,391
Available-for-sale securities, 12 months or more, unrealized (losses)   0
Available-for-sale securities, 12 months or more, fair value   0
Available-for-sale securities, total, unrealized (losses)   (7,166)
Available-for-sale securities, total, fair value   60,391
U.S. Treasury and Government    
Investment [Line Items]    
Available-for-sale securities, less than 12 months, unrealized (losses) (29) (141)
Available-for-sale securities, less than 12 months, fair value 9,741 20,352
Available-for-sale securities, 12 months or more, unrealized (losses) (214) (5)
Available-for-sale securities, 12 months or more, fair value 13,478 3,875
Available-for-sale securities, total, unrealized (losses) (243) (146)
Available-for-sale securities, total, fair value 23,219 24,227
U.S. States and Political Subdivisions    
Investment [Line Items]    
Bonds held-to-maturity, less than 12 months, unrealized (losses) (301) (37)
Bonds held-to-maturity, less than 12 months, fair value 22,605 1,937
Bonds held-to-maturity, 12 months or more, unrealized (losses) 0 0
Bonds held-to-maturity, 12 months or more, fair value 0 0
Bonds held-to-maturity, total, unrealized (losses) (301) (37)
Bonds held-to-maturity, total, fair value 22,605 1,937
Available-for-sale securities, less than 12 months, unrealized (losses) (1,274) (160)
Available-for-sale securities, less than 12 months, fair value 119,987 27,669
Available-for-sale securities, 12 months or more, unrealized (losses) (1,751) (664)
Available-for-sale securities, 12 months or more, fair value 61,992 28,010
Available-for-sale securities, total, unrealized (losses) (3,025) (824)
Available-for-sale securities, total, fair value 181,979 55,679
Residential Mortgage-Backed Securities    
Investment [Line Items]    
Bonds held-to-maturity, less than 12 months, unrealized (losses) (703) (325)
Bonds held-to-maturity, less than 12 months, fair value 58,119 49,283
Bonds held-to-maturity, 12 months or more, unrealized (losses) (1,930) (937)
Bonds held-to-maturity, 12 months or more, fair value 57,661 18,888
Bonds held-to-maturity, total, unrealized (losses) (2,633) (1,262)
Bonds held-to-maturity, total, fair value 115,780 68,171
Available-for-sale securities, less than 12 months, unrealized (losses) (54) (193)
Available-for-sale securities, less than 12 months, fair value 6,034 12,419
Available-for-sale securities, 12 months or more, unrealized (losses) (443) (136)
Available-for-sale securities, 12 months or more, fair value 13,515 1,428
Available-for-sale securities, total, unrealized (losses) (497) (329)
Available-for-sale securities, total, fair value 19,549 13,847
Collateralized Debt Securities    
Investment [Line Items]    
Bonds held-to-maturity, total, unrealized (losses) 0 0
Available-for-sale securities, less than 12 months, unrealized (losses) (2) 0
Available-for-sale securities, less than 12 months, fair value 158 0
Available-for-sale securities, 12 months or more, unrealized (losses) (4) (4)
Available-for-sale securities, 12 months or more, fair value 100 123
Available-for-sale securities, total, unrealized (losses) (6) (4)
Available-for-sale securities, total, fair value 258 123
Other Debt Securities    
Investment [Line Items]    
Bonds held-to-maturity, total, unrealized (losses) 0 0
Corporate Debt Securities    
Investment [Line Items]    
Bonds held-to-maturity, less than 12 months, unrealized (losses) (90,931) (8,444)
Bonds held-to-maturity, less than 12 months, fair value 2,969,461 951,425
Bonds held-to-maturity, 12 months or more, unrealized (losses) (59,903) (9,576)
Bonds held-to-maturity, 12 months or more, fair value 1,063,679 192,737
Bonds held-to-maturity, total, unrealized (losses) (150,834) (18,020)
Bonds held-to-maturity, total, fair value 4,033,140 1,144,162
Available-for-sale securities, less than 12 months, unrealized (losses) (65,492) (6,657)
Available-for-sale securities, less than 12 months, fair value 2,383,548 559,710
Available-for-sale securities, 12 months or more, unrealized (losses) (38,081) (9,436)
Available-for-sale securities, 12 months or more, fair value 572,600 159,532
Available-for-sale securities, total, unrealized (losses) (103,573) (16,093)
Available-for-sale securities, total, fair value $ 2,956,148 $ 719,242