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Debt - Preferred Securities (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($)
NYM Preferred Trust I |
Debt Instrument [Line Items] |
Principal value of trust preferred securities | $ 25,000
NYM Preferred Trust I | LIBOR |
Debt Instrument [Line Items] |
Interest rate, basis spread | 3.75%
NYM Preferred Trust II |
Debt Instrument [Line Items] |
Principal value of trust preferred securities | $ 20,000
NYM Preferred Trust II | LIBOR |
Debt Instrument [Line Items] |
Interest rate, basis spread | 3.95%

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