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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2022
Income Tax Disclosure [Abstract] |
Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate | Following is a summary of the major items comprising the differences in taxes from continuing operations computed at the federal statutory rate and as recorded in the consolidated statements of income:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(dollars in thousands) | 2022 |  | 2021 |  | 2022 |  | 2021
Provision at statutory rate of 21% | $ | 29,389 |  |  | $ | 16,117 |  |  | $ | 21,766 |  |  | $ | 38,051 |
Tax-exempt income: |  |  |  |  |  |  |
Tax-exempt interest | (3,413) |  |  | (2,762) |  |  | (6,406) |  |  | (5,541) |
Section 291/265 interest disallowance | 38 |  |  | 30 |  |  | 66 |  |  | 63 |
Company-owned life insurance income | (938) |  |  | (556) |  |  | (1,656) |  |  | (1,099) |
Tax-exempt income | (4,313) |  |  | (3,288) |  |  | (7,996) |  |  | (6,577) |
State income taxes | 4,085 |  |  | 2,200 |  |  | 758 |  |  | 5,173 |
Interim period effective rate adjustment | (3,967) |  |  | (662) |  |  | 3,073 |  |  | (2,437) |
Tax credit investments - federal | (1,292) |  |  | (1,430) |  |  | (2,561) |  |  | (2,523) |
Other, net | 1,062 |  |  | 1,023 |  |  | 1,210 |  |  | (97) |
Income tax expense (benefit) | $ | 24,964 |  |  | $ | 13,960 |  |  | $ | 16,250 |  |  | $ | 31,590 |
Effective tax rate | 17.8 | % |  | 18.2 | % |  | 15.7 | % |  | 17.4 | %

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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