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Premium Receivable	9 Months Ended
Premium Receivable	Sep. 30, 2021
Insurance [Abstract]
Premium Receivable	Premium Receivable Premiums receivable consists of premiums due on our mortgage insurance policies. If a mortgage insurance premium is unpaid for more than 120 days, all associated receivables are written off against earned premium and the related insurance policy is canceled. We recognize an allowance for credit losses for premiums receivable based on credit losses expected to arise over the life of the receivable. Due to the nature of our insurance policies (a necessary precondition for access to mortgage credit for covered borrowers) and the short duration of the related receivables, we do not typically experience credit losses against our premium receivables and did not establish an allowance for credit loss at September 30, 2021 and December 31, 2020. Premiums receivable may be written off prior to 120 days in the ordinary course of business for non-credit events including, but not limited to, the modification or refinancing of an underlying insured loan. We establish a reserve for the write-off of premiums receivable based on historical experience. Our premium write-off reserve was not material at September 30, 2021 or December 31, 2020.