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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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Amount, after accumulated amortization, of debt discount.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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