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Loss Reserves - Default Inventory Reconciliation (Details) - loan | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Primary Default Inventory [Roll Forward] |  |  |
Beginning delinquent inventory | 57,710 | 30,028 | 32,898
New Notices | 42,432 | 106,099 | 54,239
Cures | (64,896) | (76,107) | (52,035)
Paid claims | (1,223) | (2,245) | (4,267)
Rescissions and denials | (38) | (65) | (168)
Other items removed from inventory | (695) | 0 | (639)
Ending delinquent inventory | 33,290 | 57,710 | 30,028

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- Definition The number of loans in the primary default inventory. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventory
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Deductions from the primary default inventory resulting from loans in default being brought current. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryCures
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Additions to the primary default inventory resulting from new notices of defaulted loans. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryNewNotices
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Other deductions from the primary default inventory, including items removed for settlements + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryOtherItemsRemoved
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Deductions from the primary default inventory resulting from claims being paid, including those charged to a deductible or captive. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryPaids
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Deductions from the primary default inventory resulting from rescissions and denials. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryRescissionsAndDenials
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryRollForward
Namespace Prefix: | mtg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration