XML 71 R27.htm IDEA: XBRL DOCUMENT
v3.19.3

Investments (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2019
Investments [Abstract] |
Amortized cost, gross unrealized gains and losses and fair value of fixed income securities | The amortized cost, gross unrealized gains and losses, and fair value of investments in fixed income securities classified as available-for-sale at September 30, 2019 and December 31, 2018 are shown in tables 7.1a and 7.1b below.
Details of fixed income securities by category as of September 30, 2019
Table | 7.1a |  |  |  |  |  |  |  |
(In thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) (1) |  | Fair Value
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 197,748 |  |  | $ | 1,456 |  |  | $ | (75 | ) |  | $ | 199,129 |
Obligations of U.S. states and political subdivisions |  | 1,552,283 |  |  | 108,763 |  |  | (494 | ) |  | 1,660,552 |
Corporate debt securities |  | 2,653,124 |  |  | 74,630 |  |  | (3,151 | ) |  | 2,724,603 |
Asset backed securities (“ABS”) |  | 212,792 |  |  | 2,819 |  |  | (65 | ) |  | 215,546 |
Residential mortgage backed securities (“RMBS”) |  | 248,098 |  |  | 1,022 |  |  | (2,663 | ) |  | 246,457 |
Commercial mortgage backed securities (“CMBS”) |  | 280,364 |  |  | 6,714 |  |  | (266 | ) |  | 286,812 |
Collateralized loan obligations (“CLOs”) |  | 329,484 |  |  | 81 |  |  | (1,672 | ) |  | 327,893 |
Total fixed income securities |  | $ | 5,473,893 |  |  | $ | 195,485 |  |  | $ | (8,386 | ) |  | $ | 5,660,992 |
Details of fixed income securities by category as of December 31, 2018
Table | 7.1b |  |  |  |  |  |  |  |
(In thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) (1) |  | Fair Value
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 167,655 |  |  | $ | 597 |  |  | $ | (1,076 | ) |  | $ | 167,176 |
Obligations of U.S. states and political subdivisions |  | 1,701,826 |  |  | 29,259 |  |  | (10,985 | ) |  | 1,720,100 |
Corporate debt securities |  | 2,439,173 |  |  | 2,103 |  |  | (40,514 | ) |  | 2,400,762 |
ABS |  | 111,953 |  |  | 226 |  |  | (146 | ) |  | 112,033 |
RMBS |  | 189,238 |  |  | 32 |  |  | (10,309 | ) |  | 178,961 |
CMBS |  | 276,352 |  |  | 888 |  |  | (9,580 | ) |  | 267,660 |
CLOs |  | 310,587 |  |  | 2 |  |  | (5,294 | ) |  | 305,295 |
Total fixed income securities |  | $ | 5,196,784 |  |  | $ | 33,107 |  |  | $ | (77,904 | ) |  | $ | 5,151,987 |
(1) | At September 30, 2019 and December 31, 2018, there were no other-than-temporary impairment losses recorded in other comprehensive income.
Amortized cost and fair values of fixed income securities by contractual maturity | The amortized cost and fair values of fixed income securities at September 30, 2019, by contractual maturity, are shown in table 7.2 below. Actual maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Because most ABS, RMBS, CMBS, and CLOs provide for periodic payments throughout their lives, they are listed in separate categories.
Fixed income securities maturity schedule
Table | 7.2 |  |  |  |
|  | September 30, 2019
(In thousands) |  | Amortized cost |  | Fair Value
Due in one year or less |  | $ | 372,478 |  |  | $ | 373,388 |
Due after one year through five years |  | 1,928,972 |  |  | 1,966,387 |
Due after five years through ten years |  | 1,001,486 |  |  | 1,059,774 |
Due after ten years |  | 1,100,219 |  |  | 1,184,735 |
|  | 4,403,155 |  |  | 4,584,284 |
ABS |  | 212,792 |  |  | 215,546 |
RMBS |  | 248,098 |  |  | 246,457 |
CMBS |  | 280,364 |  |  | 286,812 |
CLOs |  | 329,484 |  |  | 327,893 |
Total as of September 30, 2019 |  | $ | 5,473,893 |  |  | $ | 5,660,992 |
Cost and fair value of investments in equity securities | The cost and fair value of investments in equity securities at September 30, 2019 and December 31, 2018 are shown in tables 7.3a and 7.3b below.
Details of equity security investments as of September 30, 2019
Table | 7.3a |  |  |  |  |  |  |  |
(In thousands) |  | Cost |  | Gross Gains |  | Gross Losses |  | Fair Value
Equity securities |  | $ | 17,205 |  |  | $ | 163 |  |  | $ | (8 | ) |  | $ | 17,360 |
Details of equity security investments as of December 31, 2018
Table | 7.3b |  |  |  |  |  |  |  |
(In thousands) |  | Cost |  | Gross Gains |  | Gross Losses |  | Fair Value
Equity securities |  | $ | 3,993 |  |  | $ | 11 |  |  | $ | (72 | ) |  | $ | 3,932 |
Aging of the fair values of securities in an unrealized loss position | Tables 7.4a and 7.4b below summarize, for all available-for-sale investments in an unrealized loss position at September 30, 2019 and December 31, 2018, the aggregate fair value and gross unrealized loss by the length of time those securities have been continuously in an unrealized loss position. The fair value amounts reported in tables 7.4a and 7.4b are estimated using the process described in Note 8 - “Fair Value Measurements” to these consolidated financial statements and in Note 3 - “Significant Accounting Policies” of the notes to the consolidated financial statements in our 2018 Annual Report on Form 10-K.
Unrealized loss aging for securities by type and length of time as of September 30, 2019
Table | 7.4a |  |  |  |  |  |  |  |  |  |  |  |
|  | Less Than 12 Months |  | 12 Months or Greater |  | Total
(In thousands) |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 25,284 |  |  | $ | (48 | ) |  | $ | 7,364 |  |  | $ | (27 | ) |  | $ | 32,648 |  |  | $ | (75 | )
Obligations of U.S. states and political subdivisions |  | 4,965 |  |  | (467 | ) |  | 10,007 |  |  | (27 | ) |  | 14,972 |  |  | (494 | )
Corporate debt securities |  | 135,541 |  |  | (2,818 | ) |  | 78,842 |  |  | (333 | ) |  | 214,383 |  |  | (3,151 | )
ABS |  | 8,998 |  |  | (65 | ) |  | — |  |  | — |  |  | 8,998 |  |  | (65 | )
RMBS |  | 47,166 |  |  | (309 | ) |  | 116,534 |  |  | (2,354 | ) |  | 163,700 |  |  | (2,663 | )
CMBS |  | 21,882 |  |  | (196 | ) |  | 13,579 |  |  | (70 | ) |  | 35,461 |  |  | (266 | )
CLOs |  | 147,272 |  |  | (1,008 | ) |  | 113,322 |  |  | (664 | ) |  | 260,594 |  |  | (1,672 | )
Total |  | $ | 391,108 |  |  | $ | (4,911 | ) |  | $ | 339,648 |  |  | $ | (3,475 | ) |  | $ | 730,756 |  |  | $ | (8,386 | )
Unrealized loss aging for securities by type and length of time as of December 31, 2018
Table | 7.4b |  |  |  |  |  |  |  |  |  |  |  |
|  |  | Less Than 12 Months |  | 12 Months or Greater |  | Total
(In thousands) |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 23,710 |  |  | $ | (15 | ) |  | $ | 69,146 |  |  | $ | (1,061 | ) |  | $ | 92,856 |  |  | $ | (1,076 | )
Obligations of U.S. states and political subdivisions |  | 316,655 |  |  | (3,875 | ) |  | 358,086 |  |  | (7,110 | ) |  | 674,741 |  |  | (10,985 | )
Corporate debt securities |  | 1,272,279 |  |  | (18,130 | ) |  | 785,627 |  |  | (22,384 | ) |  | 2,057,906 |  |  | (40,514 | )
ABS |  | 51,324 |  |  | (146 | ) |  | — |  |  | — |  |  | 51,324 |  |  | (146 | )
RMBS |  | 24 |  |  | — |  |  | 178,573 |  |  | (10,309 | ) |  | 178,597 |  |  | (10,309 | )
CMBS |  | 65,704 |  |  | (1,060 | ) |  | 163,272 |  |  | (8,520 | ) |  | 228,976 |  |  | (9,580 | )
CLOs |  | 296,497 |  |  | (5,294 | ) |  | — |  |  | — |  |  | 296,497 |  |  | (5,294 | )
Total |  | $ | 2,026,193 |  |  | $ | (28,520 | ) |  | $ | 1,554,704 |  |  | $ | (49,384 | ) |  | $ | 3,580,897 |  |  | $ | (77,904 | )

X
- Definition Tabular disclosure of investments in equity securities. + References No definition available. + Details
Name: | mtg_EquitySecuritiesTableTextBlock
Namespace Prefix: | mtg_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 + Details
Name: | us-gaap_ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration