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Income taxes - Reconciliation of Effective Income Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income taxes |  |  |
Provision for income tax at statutory rate | $ 11,239 | $ 7,177 | $ 6,067
State tax, net of federal benefit | 475 |  |
Tax exempt interest | (1,194) | (1,032) | (1,299)
Bank owned life insurance income | (119) | (299) | (159)
Residential housing program tax credits | (1,091) | (1,094) | (1,094)
Other, net | 688 | 69 | (360)
Total income tax expense | $ 9,998 | $ 4,821 | $ 3,155
Provision for income tax at statutory rate | 21.00% | 21.00% | 21.00%
State tax, net of federal benefit | 0.89 |  |
Tax exempt interest | (2.23%) | (3.02%) | (4.50%)
Bank owned life insurance income | (0.22%) | (0.87%) | (0.55%)
Residential housing program tax credits | (2.04%) | (3.20%) | (3.79%)
Other, net | 1.29% | 0.19% | (1.25%)
Total income tax expense | 18.69% | 14.10% | 10.91%

X
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + 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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