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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | $ 618,574 | $ 356,234
Less Than 12 Months, Unrealized Losses | (11,103) | (12,782)
12 Months or More, Fair Value | 974,040 | 1,778,899
12 Months or More, Unrealized Losses | (56,938) | (116,764)
Fair Value | 1,592,614 | 2,135,133
Unrealized Losses | (68,041) | (129,546)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value |  | 0
Less Than 12 Months, Unrealized Losses |  | 0
12 Months or More, Fair Value |  | 64,029
12 Months or More, Unrealized Losses |  | (4,027)
Fair Value |  | 64,029
Unrealized Losses |  | (4,027)
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 266,568 | 0
Less Than 12 Months, Unrealized Losses | (3,745) | 0
12 Months or More, Fair Value | 0 | 116,908
12 Months or More, Unrealized Losses | 0 | (12,681)
Fair Value | 266,568 | 116,908
Unrealized Losses | (3,745) | (12,681)
Agency-guaranteed residential collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 126,602 |
Less Than 12 Months, Unrealized Losses | (2,717) |
12 Months or More, Fair Value | 100,144 |
12 Months or More, Unrealized Losses | (13,395) |
Fair Value | 226,746 |
Unrealized Losses | (16,112) |
Agency-guaranteed commercial collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 85,902 |
Less Than 12 Months, Unrealized Losses | (2,819) |
12 Months or More, Fair Value | 0 |
12 Months or More, Unrealized Losses | 0 |
Fair Value | 85,902 |
Unrealized Losses | (2,819) |
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 35,710 | 29,241
Less Than 12 Months, Unrealized Losses | (265) | (392)
12 Months or More, Fair Value | 205,639 | 438,551
12 Months or More, Unrealized Losses | (1,928) | (10,626)
Fair Value | 241,349 | 467,792
Unrealized Losses | (2,193) | (11,018)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 0 | 0
Less Than 12 Months, Unrealized Losses | 0 | 0
12 Months or More, Fair Value | 77,708 | 121,636
12 Months or More, Unrealized Losses | (999) | (4,249)
Fair Value | 77,708 | 121,636
Unrealized Losses | (999) | (4,249)
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 74,373 | 23,243
Less Than 12 Months, Unrealized Losses | (976) | (1,147)
12 Months or More, Fair Value | 239,509 | 424,768
12 Months or More, Unrealized Losses | (16,064) | (33,764)
Fair Value | 313,882 | 448,011
Unrealized Losses | (17,040) | (34,911)
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 29,419 | 303,750
Less Than 12 Months, Unrealized Losses | (581) | (11,243)
12 Months or More, Fair Value | 351,040 | 613,007
12 Months or More, Unrealized Losses | (24,552) | (51,417)
Fair Value | 380,459 | 916,757
Unrealized Losses | $ (25,133) | $ (62,660)

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