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Income Taxes - Schedule of Reconciliation of Income Tax Expense Attributable to Income from Operations with Amounts Computed by Applying U.S. Federal Tax Rate to Pretax Income from Continuing Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Reconciliation of income tax expense reported to amount computed by applying the U.S. federal tax rate |  |  |  |
Provision for income taxes at the statutory rate | $ (1,376) | $ 21,424 | $ 10,914 | $ 40,290
Increase (reduction) in taxes resulting from: |  |  |  |
Excess tax benefit on share-based compensation | (761) | (270) | (2,175) | (2,194)
Tax exempt interest income | (288) | (310) | (570) | (629)
Dividends received deduction | (163) | (248) | (434) | (484)
Investment tax credit | (1,182) | (801) | (2,363) | (1,603)
ESOP dividends paid deduction | (138) | (137) | (268) | (267)
Nondeductible expenses | 258 | 826 | 574 | 1,237
Other items, net | (665) | (278) | 609 | 678
Total tax expense | $ (4,315) | $ 20,206 | $ 6,287 | $ 37,028
Reconciliation of income tax expense rate to the U.S. federal tax rate |  |  |  |
Tax rate used (as a percent) | 21.00% | 21.00% | 21.00% | 21.00%
Excess tax benefit on share-based compensation (as a percent) | 11.60% | (0.30%) | (4.20%) | (1.10%)
Effective rate reduction due to tax exempt interest income (as a percent) | 4.40% | (0.30%) | (1.10%) | (0.30%)
Effective rate reduction due to dividend received (as a percent) | 2.50% | (0.20%) | (0.80%) | (0.30%)
Effective rate reduction due to investment tax credit (as a percent) | 18.00% | (0.80%) | (4.50%) | (0.80%)
Effective rate reduction due to dividend paid to ESOP (as a percent) | 2.10% | (0.10%) | (0.50%) | (0.10%)
Effective rate reduction due to nondeductible expenses (as a percent) | (3.90%) | 0.80% | 1.10% | 0.60%
Effective rate reduction due to other items, net (as a percent) | 10.10% | (0.30%) | 1.10% | 0.30%
Total tax expense | 65.80% | 19.80% | 12.10% | 19.30%

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