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Reserve for Loss and Loss Expense (Tables)
3 Months Ended
Mar. 31, 2022
Insurance Loss Reserves [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense
Quarter ended March 31,
($ in thousands)20222021
Gross reserve for loss and loss expense, at beginning of period$4,580,903 4,260,355 
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of period578,641 554,269 
Net reserve for loss and loss expense, at beginning of period4,002,262 3,706,086 
Incurred loss and loss expense for claims occurring in the:  
Current year508,299 447,170 
Prior years(14,063)(33,769)
Total incurred loss and loss expense494,236 413,401 
Paid loss and loss expense for claims occurring in the:  
Current year91,292 80,158 
Prior years312,926 243,687 
Total paid loss and loss expense404,218 323,845 
Net reserve for loss and loss expense, at end of period4,092,280 3,795,642 
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period552,111 564,546 
Gross reserve for loss and loss expense at end of period$4,644,391 4,360,188