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Regulatory matters - Additional Information (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2016 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Capitalization |  |  |  |  |
Capital stock (as a percent) |  | 100.00% |  |  |
Period over which the Company may only declare and pay dividends out of accumulated net earnings, including accumulated net earnings acquired as a result of a merger |  | 7 years |  |  |
Funds available for transfers |  | $ 25,530,000 |  |  |
Loans outstanding |  | $ 0 | $ 0 |  |
Phase in period for capital conservation buffer | 4 years |  |  |  |
Capital conservation buffer | 2.50% | 2.50% | 1.875% | 1.25% |
Maximum |  |  |  |  |
Schedule of Capitalization |  |  |  |  |
Net earnings which must set aside as a surplus (as a percent) |  | 10.00% |  |  |
Capital conservation buffer |  |  |  |  | 0.625%
Minimum |  |  |  |  |
Schedule of Capitalization |  |  |  |  |
Net earnings to surplus funds (as a percent) |  | 10.00% |  |  |

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- Definition The period of time capital conservation buffer will be phased in. + References No definition available. + Details
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- Definition The period over which the Company may only declare and pay dividends out of accumulated net earnings, including accumulated net earnings acquired as a result of a merger. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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