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Borrowings and Subordinated Debentures - Summary of Borrowings and Debentures (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Debt Instrument [Line Items] |  |  |
Borrowings (including $123,824 and $123,116 at fair value, respectively) | $ 2,139,498 |  | $ 2,911,322
Rate | 5.87% |  | 4.92%
Assets Sold under Agreements to Repurchase, Interest Rate | 5.25% |  | 5.25%
Assets Sold under Agreements to Repurchase, Carrying Amount | $ 174,000 |  | $ 174,000
Total Borrowings | 2,142,824 |  | 2,915,416
Acquisition Discount on Senior Notes | $ (3,326) |  | $ (4,094)
Subordinated Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Rate | 5.90% | [1] | 5.93%
Subordinated notes due May 2031 |  |  |
Debt Instrument [Line Items] |  |  |
Rate Index (Quarterly Reset) | 2.52% |  |
Subordinated notes due May 2031 | Subordinated Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Rate | 3.25% | [1] | 3.25%
Subordinated Notes Due October 30, 2030 | Subordinated Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Rate | 4.375% |  | 4.375%
Rate Index (Quarterly Reset) | 4.195% |  |
AFX short-term borrowings |  |  |
Debt Instrument [Line Items] |  |  |
Balance | $ 0 |  | $ 0
Credit-Link Notes |  |  |
Debt Instrument [Line Items] |  |  |
Variable interest, percentage rate | 16.03% |  | 16.02%
Other borrowings | $ 123,824 |  | $ 123,116
Federal Home Loan Bank of San Francisco | Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of credit, current | $ 300,000 |  | $ 0
Rate | 4.45% |  | 0.00%
Federal Home Loan Bank of San Francisco | Secured Debt [Member] | Bank Term Funding Program |  |  |
Debt Instrument [Line Items] |  |  |
Line of credit, current | $ 1,545,000 |  | $ 2,618,300
Rate | 5.40% |  | 4.37%
[1] | Rates do not include the effects of discounts and issuance costs.

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