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v3.23.2

Loss Reserves - Delinquent Items (Details) - loan | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
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Aging of the Primary Delinquent Inventory [Abstract] |  |  |  |  |  |
3 months or less (in loans) | 7,663 |  | 8,820 | 6,791 |  |
4 - 11 months (in loans) | 8,070 |  | 8,217 | 7,946 |  |
12 months or more (in loans) | 8,090 |  | 9,350 | 12,118 |  |
Total primary delinquent inventory (in loans) | 23,823 | 24,757 | 26,387 | 26,855 | 30,462 | 33,290
3 months or less (as a percent) | 32.00% |  | 33.00% | 25.00% |  |
4 - 11 months (as a percent) | 34.00% |  | 31.00% | 30.00% |  |
12 months or more (as a percent) | 34.00% |  | 36.00% | 45.00% |  |
Total primary delinquent inventory (as a percent) | 100.00% |  | 100.00% | 100.00% |  |
Primary claims received inventory included in ending delinquent inventory (in loans) | 291 |  | 267 | 254 |  |
Percent of 12 months or more delinquent inventory, delinquent for more than 36 months (as a percent) | 41.00% |  | 36.00% | 29.00% |  |

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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
Namespace Prefix: | mtg_
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-types1: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-types1: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
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Namespace Prefix: | mtg_
Data Type: | dtr-types1: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 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
Balance Type: | na
Period Type: | instant

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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
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- 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
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Namespace Prefix: | mtg_
Data Type: | dtr-types1:percentItemType
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Period Type: | instant