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Borrowings and Financing Activities - Schedule of Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Total FHLB advances | $ 184,284 | $ 150,983
Senior notes |  |
Debt Instrument [Line Items] |  |
Total senior notes | 1,411,458 | 1,409,473
Senior notes | Senior Notes due 2024 |  |
Debt Instrument [Line Items] |  |
Total senior notes | 447,211 | 446,631
Senior notes | Senior Notes due 2025 |  |
Debt Instrument [Line Items] |  |
Total senior notes | 519,338 | 518,405
Senior notes | Senior Notes due 2027 |  |
Debt Instrument [Line Items] |  |
Total senior notes | 444,909 | 444,437
FHLB advances |  |
Debt Instrument [Line Items] |  |
2022 | 95,915 | 71,050
2023 | 52,995 | 52,995
2024 | 18,954 | 13,954
2025 | 9,984 | 9,984
2027 | 6,436 | 3,000
Total FHLB advances | $ 184,284 | $ 150,983

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