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Reserve for Loss and Loss Expense | 6 Months Ended
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Jun. 30, 2023
Insurance Loss Reserves [Abstract] |
Reserve for Loss and Loss Expense | Reserve for Loss and Loss Expense The table below provides a roll forward of the reserve for loss and loss expense for beginning and ending reserve balances:
|  | Six Months ended June 30,
($ in thousands) |  | 2023 |  | 2022
Gross reserve for loss and loss expense, at beginning of period |  | $ | 5,144,821 |  |  | 4,580,903 |
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of period |  | 757,513 |  |  | 578,641 |
Net reserve for loss and loss expense, at beginning of period |  | 4,387,308 |  |  | 4,002,262 |
Incurred loss and loss expense for claims occurring in the: |  |  |  |
Current year |  | 1,221,635 |  |  | 1,041,778 |
Prior years |  | (8,067) |  |  | (22,674) |
Total incurred loss and loss expense |  | 1,213,568 |  |  | 1,019,104 |
Paid loss and loss expense for claims occurring in the: |  |  |  |
Current year |  | 320,026 |  |  | 272,401 |
Prior years |  | 720,314 |  |  | 570,868 |
Total paid loss and loss expense |  | 1,040,340 |  |  | 843,269 |
Net reserve for loss and loss expense, at end of period |  | 4,560,536 |  |  | 4,178,097 |
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period |  | 616,487 |  |  | 544,082 |
Gross reserve for loss and loss expense, at end of period |  | $ | 5,177,023 |  |  | 4,722,179 |
Prior year reserve development in Six Months 2023 was favorable by $8.1 million, consisting of $16.5 million of favorable casualty reserve development, partially offset by $8.4 million of unfavorable property reserve development. The favorable casualty reserve development included $17.5 million in our workers compensation line of business and $5.0 million in our Excess and Surplus ("E&S") casualty lines of business, partially offset by $6.0 million of unfavorable casualty reserve development in our personal automobile line of business. Prior year reserve development in Six Months 2022 was favorable by $22.7 million, consisting of $32.0 million of favorable casualty reserve development, partially offset by $9.3 million of unfavorable property reserve development. The favorable casualty reserve development included $20.0 million in our workers compensation line of business, $7.0 million in our bonds line of business, and $5.0 million in our general liability line of business.

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- Definition The entire disclosure for liabilities related to future policy benefits and unpaid claims and claim adjustments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -URI https://asc.fasb.org/subtopic&trid=2560295 + Details
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