XML 51 R42.htm IDEA: XBRL DOCUMENT
v3.22.2

Fixed Maturity Securities In An Unrealized Loss Position (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract] |
Securities in an unrealized loss position | The following tables summarize all fixed maturity securities in an unrealized loss position at June 30, 2022 and December 31, 2021 by the length of time those securities have been continuously in an unrealized loss position:
| Less Than 12 Months |  | 12 Months or Greater |  | Total
(In thousands) | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
June 30, 2022 |  |  |  |  |  |  |  |  |  |  |
U.S. government and government agency | $ | 570,441 |  |  | $ | 40,355 |  |  | $ | 35,683 |  |  | $ | 2,559 |  |  | $ | 606,124 |  |  | $ | 42,914 |
State and municipal | 1,789,266 |  |  | 92,972 |  |  | 95,746 |  |  | 12,315 |  |  | 1,885,012 |  |  | 105,287 |
Mortgage-backed | 1,223,393 |  |  | 97,556 |  |  | 116,005 |  |  | 21,263 |  |  | 1,339,398 |  |  | 118,819 |
Asset-backed | 3,788,329 |  |  | 124,135 |  |  | 193,620 |  |  | 5,414 |  |  | 3,981,949 |  |  | 129,549 |
Corporate | 4,775,827 |  |  | 277,520 |  |  | 499,270 |  |  | 54,373 |  |  | 5,275,097 |  |  | 331,893 |
Foreign government | 1,292,469 |  |  | 59,376 |  |  | 246,041 |  |  | 52,367 |  |  | 1,538,510 |  |  | 111,743 |
Fixed maturity securities | $ | 13,439,725 |  |  | $ | 691,914 |  |  | $ | 1,186,365 |  |  | $ | 148,291 |  |  | $ | 14,626,090 |  |  | $ | 840,205 |
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |
U.S. government and government agency | $ | 487,712 |  |  | $ | 4,026 |  |  | $ | 17,021 |  |  | $ | 268 |  |  | $ | 504,733 |  |  | $ | 4,294 |
State and municipal | 502,333 |  |  | 7,403 |  |  | 29,547 |  |  | 2,156 |  |  | 531,880 |  |  | 9,559 |
Mortgage-backed | 558,751 |  |  | 6,900 |  |  | 106,130 |  |  | 4,762 |  |  | 664,881 |  |  | 11,662 |
Asset-backed | 3,832,944 |  |  | 18,503 |  |  | 75,385 |  |  | 291 |  |  | 3,908,329 |  |  | 18,794 |
Corporate | 2,582,860 |  |  | 29,322 |  |  | 51,095 |  |  | 3,088 |  |  | 2,633,955 |  |  | 32,410 |
Foreign government | 758,975 |  |  | 15,793 |  |  | 82,057 |  |  | 31,701 |  |  | 841,032 |  |  | 47,494 |
Fixed maturity securities | $ | 8,723,575 |  |  | $ | 81,947 |  |  | $ | 361,235 |  |  | $ | 42,266 |  |  | $ | 9,084,810 |  |  | $ | 124,213 |
Non-Investment Grade Fixed Maturity Securities | A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at June 30, 2022 is presented in the table below:
($ in thousands) | Number of Securities |  | Aggregate Fair Value |  | Gross Unrealized Loss
Foreign government | 42 |  |  | $ | 124,609 |  |  | $ | 52,655 |
Corporate | 12 |  |  | 46,437 |  |  | 5,739 |
State and municipal | 1 |  |  | 13,248 |  |  | 1,756 |
Mortgage-backed | 11 |  |  | 3,513 |  |  | 144 |
Asset-backed | 3 |  |  | 87 |  |  | 24 |
Total | 69 |  |  | $ | 187,894 |  |  | $ | 60,318 |

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

X
- Definition Non Investment Grade Marketable Securities Fixed Maturity Securities In An Unrealized Loss Position [Table Text Block] + References No definition available. + Details
Name: | wrb_NonInvestmentGradeMarketableSecuritiesFixedMaturitySecuritiesInUnrealizedLossPositionTableTextBlock
Namespace Prefix: | wrb_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Securities In Continuous Unrealized Loss Position. + References No definition available. + Details
Name: | wrb_SecuritiesInContinuousUnrealizedLossPositionTableTextBlock
Namespace Prefix: | wrb_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration