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Income Taxes - schedule of effective income tax rate reconciliation (Details) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Taxes |  |  |
Tax at statutory rate | 21.00% | 21.00% | 21.00%
Nontaxable interest and dividends | (0.50%) | (0.30%) | (0.50%)
Tax credits | (1.60%) | (1.80%) | (3.80%)
State taxes | 1.80% | 1.30% | 1.40%
Deferred tax rate change benefit | (0.60%) |  |
Other | (0.70%) | 0.70% | 0.80%
Effective Income Tax Rate Reconciliation, Percent, Total | 19.40% | 20.90% | 18.90%

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- Definition Percentage 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 changes in the income tax rates. + 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 https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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