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Income taxes - Reconciliation of Effective Income Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income taxes |  |  |
Provision for income tax at statutory rate | $ 9,527 | $ 11,239 | $ 7,177
State tax, net of federal benefit | 216 | 475 |
Tax exempt interest | (1,400) | (1,194) | (1,032)
Bank owned life insurance income | (205) | (119) | (299)
Residential housing program tax credits | (911) | (1,091) | (1,094)
Other, net | 49 | 688 | 69
Total income tax expense | $ 7,276 | $ 9,998 | $ 4,821
Provision for income tax at statutory rate | 21.00% | 21.00% | 21.00%
State tax, net of federal benefit | 0.63% | 0.89% |
Tax exempt interest | (3.09%) | (2.23%) | (3.02%)
Bank owned life insurance income | (0.45%) | (0.22%) | (0.87%)
Residential housing program tax credits | (2.01%) | (2.04%) | (3.20%)
Other, net | (0.04%) | 1.29% | 0.19%
Total income tax expense | 16.04% | 18.69% | 14.10%

X
- Definition US Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act. + References No definition available. + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible life insurance expenses. + References No definition available. + Details
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- Definition Percentage of the difference, between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority interest income (expense), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, change in enacted tax rate, prior year income taxes, change in deferred tax asset valuation allowance, and other adjustments. + References No definition available. + Details
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