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Income taxes - Schedule of Reconciliation of Income Taxes Computed at the United States Federal Statutory Tax Rates to the Provision for Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Federal taxes calculated at statutory rate | $ (1,604) | $ 6,653 | $ 4,938 | $ 17,272
Federal taxes calculated at statutory rate, percent | 21.00% | 21.00% | 21.00% | 21.00%
Increase (decrease) resulting from: |  |  |  |
State taxes, net of federal benefit | $ 100 | $ 1,512 | $ 1,266 | $ 3,855
Expense (benefit) from equity based compensation | (7) | (275) | 154 | (668)
Municipal interest income, net of interest disallowance | (422) | (211) | (996) | (650)
Bank owned life insurance | (55) | (11) | (90) | (38)
Merger costs | 126 | 0 | 289 | 0
Other | (177) | 50 | (65) | 236
Total | $ (2,040) | $ 7,718 | $ 5,495 | $ 20,007
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |
State taxes, net of federal benefit, percent | (1.30%) | 4.70% | 5.40% | 4.70%
Expense (benefit) from equity based compensation, percent | 0.10% | (0.90%) | 0.70% | (0.80%)
Municipal interest income, net of interest disallowance, percent | 5.50% | (0.70%) | (4.20%) | (0.80%)
Bank owned life insurance, percent | 0.70% | 0.10% | (0.40%) | 0.10%
Merger costs, percent | (1.60%) | 0.00% | 1.20% | 0.00%
Other, percent | 2.30% | 0.20% | (0.30%) | 0.30%
Total, percentage | 26.70% | 24.40% | 23.40% | 24.30%

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