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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)

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