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Loss Reserves - Delinquent Items (Details) - loan | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Aging of the Primary Delinquent Inventory [Abstract] |  |  |  |  |  |
3 months or less (in loans) | 6,791 |  | 7,586 | 6,513 |  |
4 - 11 months (in loans) | 7,946 |  | 7,990 | 12,840 |  |
12 months or more (in loans) | 12,118 |  | 17,714 | 23,646 |  |
Total primary delinquent inventory (in loans) | 26,855 | 30,462 | 33,290 | 42,999 | 52,775 | 57,710
3 months or less (as a percent) | 25.00% |  | 23.00% | 15.00% |  |
4 - 11 months (as a percent) | 30.00% |  | 24.00% | 30.00% |  |
12 months or more (as a percent) | 45.00% |  | 53.00% | 55.00% |  |
Total primary delinquent inventory (as a percent) | 100.00% |  | 100.00% | 100.00% |  |
Primary claims received inventory included in ending delinquent inventory (in loans) | 254 |  | 211 | 159 |  |
Percent of 12 months or more delinquent inventory, delinquent for more than 36 months (as a percent) | 29.00% |  | 20.00% | 15.00% |  |

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- References No definition available. + Details
Name: | mtg_AgingOfPrimaryDefaultInventoryAbstract
Namespace Prefix: | mtg_
Data Type: | xbrli:stringItemType
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- Definition The number of loans in the primary default inventory. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventory
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Data Type: | xbrli:integerItemType
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- Definition The number of loans in the primary default inventory that are in the claims received inventory. + References No definition available. + Details
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- Definition The number of loans that have been in the primary default inventory for at least four months but no greater than eleven months as of the balance sheet date. + References No definition available. + Details
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- Definition The percentage of loans that have been in the primary default inventory for at least four months but no greater than eleven months as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | mtg_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The percentage of loans in the primary default inventory. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryPercentage
Namespace Prefix: | mtg_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of loans that have been in the primary default inventory for three months or less as of the balance sheet date. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryThreeMonthsOrLess
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
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Period Type: | instant

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- Definition The percentage of loans that have been in the primary default inventory for three months or less as of the balance sheet date. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryThreeMonthsOrLessPercentage
Namespace Prefix: | mtg_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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- Definition The number of loans that have been in the primary default inventory for twelve months or more as of the balance sheet date. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryTwelveMonthsOrMore
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
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- Definition Primary Default Inventory Twelve Months Or More, Percent Of Primary Default Inventory In Default For Twelve Months Or More In Default For More Than Thirty Six Consecutive Months + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryTwelveMonthsOrMorePercentOfPrimaryDefaultInventoryInDefaultForTwelveMonthsOrMoreInDefaultForMoreThanThirtySixConsecutiveMonths
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X
- Definition The percentage of loans that have been in the primary default inventory for twelve months or more as of the balance sheet date. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryTwelveMonthsOrMorePercentage
Namespace Prefix: | mtg_
Data Type: | dtr-types:percentItemType
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