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v3.21.2

Borrowings - Senior notes and Subordinate Notes (Details) - USD ($) $ in Thousands | Jun. 01, 2020 | May 25, 2017 | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Long-term debt |  |  |  |
Unamortized debt issuance cost |  |  | $ 2,453 | $ 2,965
3.75% notes maturing May 25, 2022 | Senior notes |  |  |  |
Long-term debt |  |  |  |
Issuance of debt |  | $ 40,000 |  |
Interest rate (as a percent) |  | 3.75% |  |
Unamortized debt issuance cost |  |  | 90 | 191
4.75% notes maturing May 25, 2027 | Subordinated debt |  |  |  |
Long-term debt |  |  |  |
Issuance of debt |  | $ 60,000 |  |
Fixed payment term of note |  | 5 years |  |
Duration of fixed interest rate |  | 5 years |  |
Unamortized debt issuance cost |  |  | 575 | 651
4.75% notes maturing May 25, 2027 | First Five Years | Subordinated debt |  |  |  |
Long-term debt |  |  |  |
Interest rate (as a percent) |  | 4.75% |  |
4.75% notes maturing May 25, 2027 | Three-month LIBOR | Subordinated debt |  |  |  |
Long-term debt |  |  |  |
Floating interest rate margin (as a percent) |  | 2.919% |  |
5.25% notes maturing June 1, 2030 | Subordinated debt |  |  |  |
Long-term debt |  |  |  |
Issuance of debt | $ 125,000 |  |  |
Duration of fixed interest rate | 5 years |  |  |
Floating interest rate margin (as a percent) | 5.11% |  |  |
Unamortized debt issuance cost |  |  | $ 1,788 | $ 2,123
5.25% notes maturing June 1, 2030 | First Five Years | Subordinated debt |  |  |  |
Long-term debt |  |  |  |
Interest rate (as a percent) | 5.25% |  |  |

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