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Borrowings - Narrative (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended | 69 Months Ended | 119 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 15, 2024 | May 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Jan. 16, 2024 | Oct. 30, 2020 | Dec. 16, 2019 | Mar. 25, 2019 | Feb. 11, 2014 | Sep. 17, 2003
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Market value pledged to repurchase agreements |  |  | $ 358,400,000 | $ 381,400,000 | $ 358,400,000 |  |  |  |  |  |
Notes and subordinated debt |  |  | $ 899,071,000 | 1,036,974,000 | $ 899,071,000 |  |  |  |  |  |
Senior Notes Due 2024 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notes and subordinated debt |  |  |  |  |  |  |  |  |  | $ 150,000,000.0 |
Debt instrument, stated interest rate, percentage |  |  |  |  |  |  |  |  |  | 4.375% |
Amount repurchased and retired |  | $ 17,500,000 |  |  |  |  |  |  |  |  |
Repurchased and retired in cents on the dollar |  | $ 0.96 |  |  |  |  |  |  |  |  |
Gain recognized upon extinguishment |  |  |  | $ 700,000 |  |  |  |  |  |  |
Repayment of long-term debt | $ 132,600,000 |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2024 | Senior Notes | US Treasury (UST) Interest Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread |  |  |  |  |  | 0.30% |  |  |  |  |
Senior Notes Due 2029 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notes and subordinated debt |  |  |  |  |  |  |  |  | $ 300,000,000.0 |  |
Debt instrument, stated interest rate, percentage |  |  |  |  |  |  |  |  | 4.10% |  |
Senior Notes Due 2029 | Senior Notes | US Treasury (UST) Interest Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread |  |  |  |  | 0.25% |  |  |  |  |  |
2029 subordinated notes | Sterling |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | $ 274,000,000 |  |  |
Fixed-to-floating rate |  |  |  |  |  |  |  | 4.00% |  |  |
Interest rate on notes |  |  | 6.84% |  | 6.84% |  |  |  |  |  |
2029 subordinated notes | Subordinated Debt | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread |  |  | 2.53% |  |  |  |  |  |  |  |
2030 subordinated notes | Sterling |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 225,000,000.0 |  |  |  |
Fixed-to-floating rate |  |  |  |  |  |  | 3.875% |  |  |  |
2030 subordinated notes | Subordinated Debt | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread |  |  | 3.69% |  |  |  |  |  |  |  |
2033 Junior Subordinated Notes | Junior Subordinated Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notes and subordinated debt |  |  |  |  |  |  |  |  |  |  | $ 77,300,000
2033 Junior Subordinated Notes | Junior Subordinated Debt | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes |  |  | 7.56% | 8.59% | 7.56% |  |  |  |  |  |
Interest rate spread of LIBOR plus (as a percent) |  |  |  |  |  |  | 2.95% |  |  |  |

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