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Subordinated debt (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Sep. 28, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |
Net proceeds from subordinated debt |  | $ 39,158,444 | $ 0
Subordinated Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | $ 40,000,000 |  |
Net proceeds from subordinated debt |  | 12,000,000 |
Interest rate | 5.625% |  |
Debt issuance costs | $ 842,000 | 823,000 |
Amortization expense of debt issuance costs |  | $ 19,000 |
Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate (as a percent) |  | 2.55% |
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayment of line of credit | $ 15,000,000 |  |

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