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Employee benefit plans - Salaries and Employee Benefits Expense - Profit Sharing (Details) - Retirement Profit Sharing Plan - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Profit Sharing plan |  |  |
Company contribution | $ 1,207 | $ 1,139 | $ 1,047
Safe harbor contribution | 655 | 627 | 578
Discretionary contributions | $ 552 | $ 512 | $ 469

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- Definition Amount of safe harbor contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement. + References No definition available. + Details
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- Definition Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement. + 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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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Details
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