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v3.20.1

Subordinated debt (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 28, 2018
Debt Instrument [Line Items] |  |  |
Debt issuance costs | $ 739,000 | $ 823,000 |
Subordinated Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount |  |  | $ 40,000,000
Interest rate |  |  | 5.625%
Debt issuance costs |  |  | $ 842,000
Amortization expense of debt issuance costs | $ 84,000 | $ 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% |  |

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