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Shareholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2024
Equity [Abstract] |
Schedule of Components of AOCI, Net of Tax | The changes in the balance of each component of AOCI for the three months ended March 31, 2024 and 2023 were as follows:
(In thousands) | Unrealized Investment Gains (Losses) |  | Cash Flow Hedging Gains (Losses) (1) |  | Non-credit Impairments |  | Unrecognized Change in Defined Benefit Plan Liabilities |  | Accumulated Other Comprehensive Income (Loss)
Balance, December 31, 2023 | $ | (206,327) |  |  | $ | 3,026 |  |  | $ | (11) |  |  | $ | (1,177) |  |  | $ | (204,489) |
OCI, before reclassifications, net of tax | (6,339) |  |  | 4,074 |  |  | (455) |  |  | — |  |  | (2,720) |
Amounts reclassified from AOCI, net of tax | 1,321 |  |  | (1,073) |  |  | — |  |  | — |  |  | 248 |
Net OCI, current period | (5,018) |  |  | 3,001 |  |  | (455) |  |  | — |  |  | (2,472) |
Balance, March 31, 2024 | $ | (211,345) |  |  | $ | 6,027 |  |  | $ | (466) |  |  | $ | (1,177) |  |  | $ | (206,961) |
(In thousands) | Unrealized Investment Gains (Losses) |  | Non-credit Impairments |  | Unrecognized Change in Defined Benefit Plan Liabilities |  | Accumulated Other Comprehensive Income (Loss)
Balance, December 31, 2022 | $ | (297,142) |  |  | $ | (11) |  |  | $ | (1,454) |  |  | $ | (298,607) |
OCI, before reclassifications, net of tax | 40,007 |  |  | — |  |  | — |  |  | 40,007 |
Amounts reclassified from AOCI, net of tax | 2,622 |  |  | — |  |  | — |  |  | 2,622 |
Net OCI, current period | 42,629 |  |  | — |  |  | — |  |  | 42,629 |
Balance, March 31, 2023 | $ | (254,513) |  |  | $ | (11) |  |  | $ | (1,454) |  |  | $ | (255,978) |
(1) ProAssurance entered into two forward-starting interest rate swap agreements ("Interest Rate Swaps") on May 2, 2023, which are designated and qualify as highly effective cash flow hedges. See Note 8 for additional information on the Interest Rate Swaps.

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