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Losses and LAE - Reserve for Losses and LAE by Segment (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total reserve for losses and LAE | $ 483,664 | $ 828,642 |  |
Mortgage insurance |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total reserve for losses and LAE | 477,747 | 823,136 | $ 888,021 | $ 844,107
Mortgage insurance | Primary case |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total reserve for losses and LAE | 454,726 | 790,380 |  |
Mortgage insurance | Primary IBNR and LAE |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total reserve for losses and LAE | 13,672 | 22,745 |  |
Mortgage insurance | Pool and other |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total reserve for losses and LAE | 9,349 | 10,011 |  |
Title insurance |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total reserve for losses and LAE | $ 5,917 | $ 5,506 |  |

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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