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Portfolio loans and allowance for loan losses - Analysis of loans past due and still accruing or non-accrual status (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Loans past due |  |  |
Loans past due, still accruing | $ 1,611 | $ 1,601 |
Non-accrual Loans | 27,896 | 34,997 |
Amount of interest collected and recognized on a cash basis |  |  | $ 300
30 to 59 Days |  |  |
Loans past due |  |  |
Loans past due, still accruing | 8,820 | 5,053 |
60 to 89 Days |  |  |
Loans past due |  |  |
Loans past due, still accruing | 5,451 | 2,068 |
Commercial |  |  |
Loans past due |  |  |
Loans past due, still accruing | 199 | 775 |
Non-accrual Loans | 9,096 | 17,953 |
Commercial | 30 to 59 Days |  |  |
Loans past due |  |  |
Loans past due, still accruing | 1,075 | 158 |
Commercial | 60 to 89 Days |  |  |
Loans past due |  |  |
Loans past due, still accruing | 1,014 | 140 |
Commercial real estate |  |  |
Loans past due |  |  |
Loans past due, still accruing | 584 |  |
Non-accrual Loans | 9,178 | 10,298 |
Commercial real estate | 30 to 59 Days |  |  |
Loans past due |  |  |
Loans past due, still accruing | 2,653 | 148 |
Commercial real estate | 60 to 89 Days |  |  |
Loans past due |  |  |
Loans past due, still accruing | 3,121 | 558 |
Real estate construction |  |  |
Loans past due |  |  |
Loans past due, still accruing |  | 58 |
Non-accrual Loans | 630 | 18 |
Real estate construction | 30 to 59 Days |  |  |
Loans past due |  |  |
Loans past due, still accruing | 19 | 121 |
Retail Real Estate |  |  |
Loans past due |  |  |
Loans past due, still accruing | 828 | 766 |
Non-accrual Loans | 8,935 | 6,698 |
Retail Real Estate | 30 to 59 Days |  |  |
Loans past due |  |  |
Loans past due, still accruing | 5,021 | 4,578 |
Retail Real Estate | 60 to 89 Days |  |  |
Loans past due |  |  |
Loans past due, still accruing | 1,248 | 1,368 |
Retail Other |  |  |
Loans past due |  |  |
Loans past due, still accruing |  | 2 |
Non-accrual Loans | 57 | 30 |
Retail Other | 30 to 59 Days |  |  |
Loans past due |  |  |
Loans past due, still accruing | 52 | 48 |
Retail Other | 60 to 89 Days |  |  |
Loans past due |  |  |
Loans past due, still accruing | $ 68 | $ 2 |

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