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Fair value of financial instruments - Additional Information (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of Fair value of financial instruments [Line Items] |  |
Interest receivable Loans | $ 7 |
Unearned interest and deferred fees | 0 |
Lease liabilities excluded | 18,700,000 | $ 19,900,000
Loan Commitments |  |
Disclosure of Fair value of financial instruments [Line Items] |  |
Interest receivable Loans | 27,300,000 | 41,700,000
Allowance for loans losses | 41,100,000 | 99,300,000
Unearned interest and deferred fees | 5,800,000 | 12,100,000
Securities at amortized cost |  |
Disclosure of Fair value of financial instruments [Line Items] |  |
Interest receivable Loans | 1,900,000 | 800,000
Allowance for loans losses | $ 400,000 | $ 100,000

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