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Debt Schedule of Long-term Debt instruments (Details) - Junior Subordinated Debt - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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ACST II |  |
Debt Instrument [Line Items] |  |
Face amount | $ 10,000,000 | $ 10,000,000
Variable Interest Rate | 3.37% | 5.25%
Fixed Interest Rate resulting from cash flow hedge agreement | 4.00% |
ACST III |  |
Debt Instrument [Line Items] |  |
Face amount | $ 10,000,000 | $ 10,000,000
Variable Interest Rate | 2.22% | 4.10%
Fixed Interest Rate resulting from cash flow hedge agreement | 2.86% |

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