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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value $ 532,265 $ 1,585,495
Less than 12 Months, Unrealized Losses (29,079) (102,076)
12 Months or More, Fair Value 1,910,791 901,562
12 Months or More, Unrealized Losses (146,499) (75,307)
Total, Fair Value 2,443,056 2,487,057
Total, Unrealized Losses (175,578) (177,383)
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 21,932 160,542
Less than 12 Months, Unrealized Losses (23) (8,050)
12 Months or More, Fair Value 52,780 0
12 Months or More, Unrealized Losses (3,409) 0
Total, Fair Value 74,712 160,542
Total, Unrealized Losses (3,432) (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 125,308 0
12 Months or More, Unrealized Losses (13,561) 0
Total, Fair Value 125,308 133,864
Total, Unrealized Losses (13,561) (13,617)
Collateralized loan obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 89,992 386,701
Less than 12 Months, Unrealized Losses (2,442) (13,516)
12 Months or More, Fair Value 599,341 315,270
12 Months or More, Unrealized Losses (15,562) (10,826)
Total, Fair Value 689,333 701,971
Total, Unrealized Losses (18,004) (24,342)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 17,756 39,828
Less than 12 Months, Unrealized Losses (506) (1,410)
12 Months or More, Fair Value 114,718 93,005
12 Months or More, Unrealized Losses (3,961) (4,456)
Total, Fair Value 132,474 132,833
Total, Unrealized Losses (4,467) (5,866)
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 105,912 386,464
Less than 12 Months, Unrealized Losses (3,892) (36,119)
12 Months or More, Fair Value 424,070 178,955
12 Months or More, Unrealized Losses (50,457) (25,759)
Total, Fair Value 529,982 565,419
Total, Unrealized Losses (54,349) (61,878)
Private label collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 296,673 478,096
Less than 12 Months, Unrealized Losses (22,216) (29,364)
12 Months or More, Fair Value 594,574 314,332
12 Months or More, Unrealized Losses (59,549) (34,266)
Total, Fair Value 891,247 792,428
Total, Unrealized Losses $ (81,765) $ (63,630)