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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value $ 356,234 $ 1,585,495
Less Than 12 Months, Unrealized Losses (12,782) (102,076)
12 Months or More, Fair Value 1,778,899 901,562
12 Months or More, Unrealized Losses (116,764) (75,307)
Fair Value 2,135,133 2,487,057
Unrealized Losses (129,546) (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 64,029 0
12 Months or More, Unrealized Losses (4,027) 0
Fair Value 64,029 160,542
Unrealized Losses (4,027) (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 116,908 0
12 Months or More, Unrealized Losses (12,681) 0
Fair Value 116,908 133,864
Unrealized Losses (12,681) (13,617)
Collateralized loan obligations    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 29,241 386,701
Less Than 12 Months, Unrealized Losses (392) (13,516)
12 Months or More, Fair Value 438,551 315,270
12 Months or More, Unrealized Losses (10,626) (10,826)
Fair Value 467,792 701,971
Unrealized Losses (11,018) (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 121,636 93,005
12 Months or More, Unrealized Losses (4,249) (4,456)
Fair Value 121,636 132,833
Unrealized Losses (4,249) (5,866)
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 23,243 386,464
Less Than 12 Months, Unrealized Losses (1,147) (36,119)
12 Months or More, Fair Value 424,768 178,955
12 Months or More, Unrealized Losses (33,764) (25,759)
Fair Value 448,011 565,419
Unrealized Losses (34,911) (61,878)
Private label collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 303,750 478,096
Less Than 12 Months, Unrealized Losses (11,243) (29,364)
12 Months or More, Fair Value 613,007 314,332
12 Months or More, Unrealized Losses (51,417) (34,266)
Fair Value 916,757 792,428
Unrealized Losses $ (62,660) $ (63,630)