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Investment Securities - Summary of Investment Securities by Stated Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, due in one year or less | $ 21,465 |
Amortized cost, due after one year through five years | 507,162 |
Amortized cost, due after five years through ten years | 128,459 |
Amortized Cost | 3,138,534 | $ 3,799,851
Fair value, due in one year or less | 21,499 |
Fair value, due after one year through five years | 460,649 |
Fair value, due after five years through ten years | 113,105 |
Fair Value | 2,961,015 | 3,791,575
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities without single maturity date, amortized cost | 169,170 |
Amortized Cost | 169,170 | 297,291
Debt securities without single maturity date, fair value | 160,542 |
Fair Value | 160,542 | 297,425
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities without single maturity date, amortized cost | 896,992 |
Amortized Cost | 896,992 | 1,067,770
Debt securities without single maturity date, fair value | 872,738 |
Fair Value | 872,738 | 1,066,802
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities without single maturity date, amortized cost | 142,222 |
Amortized Cost | 142,222 | 149,054
Debt securities without single maturity date, fair value | 136,357 |
Fair Value | 136,357 | 148,927
Agency-guaranteed residential collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities without single maturity date, amortized cost | 147,481 |
Amortized Cost | 147,481 | 199,091
Debt securities without single maturity date, fair value | 133,864 |
Fair Value | 133,864 | 196,930
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities without single maturity date, amortized cost | 1,125,583 |
Amortized Cost | 1,125,583 | 1,248,142
Debt securities without single maturity date, fair value | 1,062,261 |
Fair Value | $ 1,062,261 | $ 1,242,465

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