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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value $ 285,238 $ 1,585,495
Less than 12 Months, Unrealized Losses (15,183) (102,076)
12 Months or More, Fair Value 2,070,331 901,562
12 Months or More, Unrealized Losses (135,150) (75,307)
Total, Fair Value 2,355,569 2,487,057
Total, Unrealized Losses (150,333) (177,383)
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 0 160,542
Less than 12 Months, Unrealized Losses 0 (8,050)
12 Months or More, Fair Value 42,932 0
12 Months or More, Unrealized Losses (2,547) 0
Total, Fair Value 42,932 160,542
Total, Unrealized Losses (2,547) (8,050)
Agency-guaranteed residential collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 0 133,864
Less than 12 Months, Unrealized Losses 0 (13,617)
12 Months or More, Fair Value 133,425 0
12 Months or More, Unrealized Losses (14,956) 0
Total, Fair Value 133,425 133,864
Total, Unrealized Losses (14,956) (13,617)
Collateralized loan obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 46,333 386,701
Less than 12 Months, Unrealized Losses (1,472) (13,516)
12 Months or More, Fair Value 614,978 315,270
12 Months or More, Unrealized Losses (10,253) (10,826)
Total, Fair Value 661,311 701,971
Total, Unrealized Losses (11,725) (24,342)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 0 39,828
Less than 12 Months, Unrealized Losses 0 (1,410)
12 Months or More, Fair Value 134,866 93,005
12 Months or More, Unrealized Losses (4,923) (4,456)
Total, Fair Value 134,866 132,833
Total, Unrealized Losses (4,923) (5,866)
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 84,827 386,464
Less than 12 Months, Unrealized Losses (3,106) (36,119)
12 Months or More, Fair Value 469,187 178,955
12 Months or More, Unrealized Losses (45,202) (25,759)
Total, Fair Value 554,014 565,419
Total, Unrealized Losses (48,308) (61,878)
Private label collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 154,078 478,096
Less than 12 Months, Unrealized Losses (10,605) (29,364)
12 Months or More, Fair Value 674,943 314,332
12 Months or More, Unrealized Losses (57,269) (34,266)
Total, Fair Value 829,021 792,428
Total, Unrealized Losses $ (67,874) $ (63,630)