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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value $ 689,933 $ 1,585,495
Less than 12 Months, Unrealized Losses (27,949) (102,076)
12 Months or More, Fair Value 1,835,862 901,562
12 Months or More, Unrealized Losses (134,878) (75,307)
Total, Fair Value 2,525,795 2,487,057
Total, Unrealized Losses (162,827) (177,383)
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 21,902 160,542
Less than 12 Months, Unrealized Losses (46) (8,050)
12 Months or More, Fair Value 99,525 0
12 Months or More, Unrealized Losses (3,968) 0
Total, Fair Value 121,427 160,542
Total, Unrealized Losses (4,014) (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 133,753 0
12 Months or More, Unrealized Losses (9,964) 0
Total, Fair Value 133,753 133,864
Total, Unrealized Losses (9,964) (13,617)
Collateralized loan obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 209,389 386,701
Less than 12 Months, Unrealized Losses (3,648) (13,516)
12 Months or More, Fair Value 582,070 315,270
12 Months or More, Unrealized Losses (17,840) (10,826)
Total, Fair Value 791,459 701,971
Total, Unrealized Losses (21,488) (24,342)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 17,742 39,828
Less than 12 Months, Unrealized Losses (520) (1,410)
12 Months or More, Fair Value 115,676 93,005
12 Months or More, Unrealized Losses (4,716) (4,456)
Total, Fair Value 133,418 132,833
Total, Unrealized Losses (5,236) (5,866)
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 152,391 386,464
Less than 12 Months, Unrealized Losses (8,607) (36,119)
12 Months or More, Fair Value 341,401 178,955
12 Months or More, Unrealized Losses (42,169) (25,759)
Total, Fair Value 493,792 565,419
Total, Unrealized Losses (50,776) (61,878)
Private label collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 288,509 478,096
Less than 12 Months, Unrealized Losses (15,128) (29,364)
12 Months or More, Fair Value 563,437 314,332
12 Months or More, Unrealized Losses (56,221) (34,266)
Total, Fair Value 851,946 792,428
Total, Unrealized Losses $ (71,349) $ (63,630)