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Debt Schedule of Long-term Debt instruments (Details) - Junior Subordinated Debt - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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ACST II |  |
Debt Instrument [Line Items] |  |
Balance at December 31, | $ 10,000,000 | $ 10,000,000
Period-End Interest Rate | 5.55% | 4.49%
ACST III |  |
Debt Instrument [Line Items] |  |
Balance at December 31, | $ 10,000,000 | $ 10,000,000
Period-End Interest Rate | 4.40% | 3.34%

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