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Reserve for Loss and Loss Expense
 6 Months Ended
Jun. 30, 2021
Insurance Loss Reserves [Abstract]  
Reserve for Loss and Loss Expense Reserve for Loss and Loss Expense
The table below provides a roll forward of reserve for loss and loss expense balances:
Six Months ended June 30,
($ in thousands)20212020
Gross reserve for loss and loss expense, at beginning of year$4,260,355 4,067,163 
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year1
554,269 547,066 
Net reserve for loss and loss expense, at beginning of year3,706,086 3,520,097 
Incurred loss and loss expense for claims occurring in the:  
Current year886,801 825,201 
Prior years(51,777)(20,928)
Total incurred loss and loss expense835,024 804,273 
Paid loss and loss expense for claims occurring in the:  
Current year227,505 221,422 
Prior years455,919 479,736 
Total paid loss and loss expense683,424 701,158 
Net reserve for loss and loss expense, at end of period3,857,686 3,623,212 
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period579,567 553,694 
Gross reserve for loss and loss expense at end of period$4,437,253 4,176,906 
1 Six Months 2020 includes an adjustment of $2.9 million related to our adoption of ASU 2016-13, Financial Instruments - Credit Losses.

Prior year reserve development in Six Months 2021 was favorable by $51.8 million, which included $52.0 million of casualty reserve development. The favorable casualty reserve development included $25.0 million in our general liability line of business, $20.0 million in our workers compensation line of business, and $7.0 million in our Excess and Surplus ("E&S") casualty lines of business.

Prior year reserve development in Six Months 2020 was favorable by $20.9 million, which included $25.0 million of casualty reserve development, partially offset by $4.1 million of unfavorable property reserve development. The favorable casualty reserve development included $25 million in our workers compensation line of business and $10 million in our general liability line of business, partially offset by $10.0 million of unfavorable reserve development in our commercial automobile line of business.