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Salaries and other employee expenses - Narrative (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2008 shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |  |
Restricted shares, charged against income |  | $ 401,000 | $ 306,000 | $ 570,000
Restricted shares to directors |  | 924,000 | 1,100,000 | 1,400,000
Cost pending amortization |  | $ 697,000 |  |
Duration of amortization of restricted cash |  | 2 years 3 months 29 days |  |
Vested shares, fair value |  | $ 949,000 | 1,100,000 | 1,400,000
Amortization cost, restricted shares |  | 984,000 | 640,000 | 359,000
Balance outstanding, restricted shares |  | $ 592,000 |  |
Duration of amortization of restricted cash |  | 3 years 2 months 1 day |  |
Weighted average fair value at measurement date, share options vested |  | $ 838,000 | 256,000 | 168,000
Expiration period |  | 7 years |  |
Exercise rate of outstanding share options |  | 25.00% |  |
Wages and salaries |  | $ 13,803,000 | $ 13,717,000 | 13,232,000
“Class E” |  |  |  |
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |  |
Granted (in shares) |  | 63,000 |  |
Number of shares issued | shares |  |  | 57,000 |
Percentage of vesting of restricted share |  | 25.00% |  |
Key management personnel of entity or parent |  |  |  |
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |  |
Value of granted restricted share options |  | $ 1,000,000 | $ 902,000 | 355,000
Wages and salaries |  | 67,000 | 75,000 | 87,000
Maximum of the year | Key management personnel of entity or parent | “Class E” |  |  |  |
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |  |
Number of shares to be granted | shares | 3,000,000 |  |  |
Restricted Stocks |  |  |  |
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |  |
Fair value, restricted shares granted |  | $ 923,000 | $ 727,000 | $ 1,300,000
Restricted Stocks | Key management personnel of entity or parent |  |  |  |
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |  |
Granted (in shares) | shares |  | 75,796 | 51,829 | 23,743
Stock options |  |  |  |
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |  |
Number of share options exercised in share-based payment arrangement | shares |  | 0 | 0 | 0
share-based payment arrangements, Tranche two | Restricted Stocks |  |  |  |
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |  |
Percent of award vesting rights for share-based payment arrangement |  | 35.00% |  |
share-based payment arrangements, Tranche three | Restricted Stocks |  |  |  |
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |  |
Percent of award vesting rights for share-based payment arrangement |  | 30.00% |  |

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