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Subordinated Debt - Schedule of Subordinated Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Principal | $ 514,920 | $ 514,916
Unamortized Debt Issuance Costs | (2,844) | (2,397)
Subordinated Debt |  |
Debt Instrument [Line Items] |  |
Principal | 107,000 | 82,000
Unamortized Debt Issuance Costs | (2,844) | (2,397)
Subordinated Debt | 2025 Note |  |
Debt Instrument [Line Items] |  |
Principal | 0 | 10,000
Unamortized Debt Issuance Costs | 0 | (114)
Subordinated Debt | 2026 Notes |  |
Debt Instrument [Line Items] |  |
Principal | 0 | 25,000
Unamortized Debt Issuance Costs | 0 | (715)
Subordinated Debt | 2029 Notes |  |
Debt Instrument [Line Items] |  |
Principal | 37,000 | 37,000
Unamortized Debt Issuance Costs | (1,218) | (1,337)
Subordinated Debt | 2030 Notes |  |
Debt Instrument [Line Items] |  |
Principal | 10,000 | 10,000
Unamortized Debt Issuance Costs | (213) | (231)
Subordinated Debt | 2031 Notes |  |
Debt Instrument [Line Items] |  |
Principal | 60,000 | 0
Unamortized Debt Issuance Costs | $ (1,413) | $ 0

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