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Debt - Preferred Securities (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2020 | Dec. 31, 2020
NYM Preferred Trust I |  |  |
Debt Instrument [Line Items] |  |  |
Principal value of trust preferred securities | $ 25,000,000 |  | $ 25,000,000
NYM Preferred Trust I | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, basis spread | 3.75% | 3.75% |
NYM Preferred Trust II |  |  |
Debt Instrument [Line Items] |  |  |
Principal value of trust preferred securities | $ 20,000,000 |  | $ 20,000,000
NYM Preferred Trust II | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, basis spread | 3.95% | 3.95% |

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