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Allowance for Credit Losses on Premiums Receivable (Tables)
12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Premium Receivable, Allowance for Credit Loss
($ in thousands)December 31, 2020
Balance at beginning of year$6,400 
Cumulative effect adjustment1
1,058 
Balance at beginning of year, as adjusted$7,458 
Current period provision for expected credit losses16,751 
Write-offs charged against the allowance for credit losses(3,754)
Recoveries545 
ACL, end of year$21,000