Subordinated Debt - Schedule of Subordinated Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Unamortized Debt Issuance Costs	$ (2,242)	$ (2,472)
Subordinated Debt
Debt Instrument [Line Items]
Principal	72,000	72,000
Unamortized Debt Issuance Costs	(2,242)	(2,472)
Subordinated Debt | 2025 Note
Debt Instrument [Line Items]
Principal	10,000	10,000
Unamortized Debt Issuance Costs	(120)	(138)
Subordinated Debt | 2026 Notes
Debt Instrument [Line Items]
Principal	25,000	25,000
Unamortized Debt Issuance Costs	(746)	(839)
Subordinated Debt | 2029 Notes
Debt Instrument [Line Items]
Principal	37,000	37,000
Unamortized Debt Issuance Costs	$ (1,376)	$ (1,495)