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Portfolio loans and allowance for credit losses - Summary of TDR loans (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Restructured loans |  |
Total loans | $ 5,078 | $ 5,707
In compliance with modified terms |  |
Restructured loans |  |
Total loans | 3,814 | 5,005
30-89 days past due |  |
Restructured loans |  |
Total loans | 15 |
Included in non-performing loans |  |
Restructured loans |  |
Total loans | $ 1,249 | $ 702

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