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Reinsurance - Coverage and retention (Details) - Variable Interest Entity, Not Primary Beneficiary $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($)
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | $ 7,270,589 |
Current Coverage | 4,005,479 |
Remaining Retention, Net | $ 2,423,805 |
Amortization period | 10 years |
Bellemeade 2017-1 Ltd |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | $ 368,114 | [1]
Current Coverage | 36,679 | [1]
Remaining Retention, Net | 142,461 | [1]
Bellemeade 2018-1 Ltd |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 374,460 | [2]
Current Coverage | 89,698 | [2]
Remaining Retention, Net | 143,592 | [2]
Bellemeade 2018-3 Ltd |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 506,110 | [3]
Current Coverage | 199,237 | [3]
Remaining Retention, Net | 152,861 | [3]
Bellemeade 2019-1 Ltd |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 341,790 | [4]
Current Coverage | 107,880 | [4]
Remaining Retention, Net | 118,908 | [4]
Bellemeade 2019-2 Ltd |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 621,022 | [5]
Current Coverage | 325,462 | [5]
Remaining Retention, Net | 191,550 | [5]
Bellemeade 2019-3 Ltd |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 700,920 | [6]
Current Coverage | 222,977 | [6]
Remaining Retention, Net | 208,931 | [6]
Bellemeade 2019-4 Ltd |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 577,267 | [7]
Current Coverage | 266,124 | [7]
Remaining Retention, Net | 142,564 | [7]
Bellemeade 2020-2 Ltd |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 449,167 | [8]
Current Coverage | 105,110 | [8]
Remaining Retention, Net | 237,709 | [8]
Bellemeade 2020-2 Ltd | Funded By VIE |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 423,000 |
Bellemeade 2020-2 Ltd | Directly provided capacity |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 26,000 |
Bellemeade 2020-3 Ltd |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 451,816 | [9]
Current Coverage | 250,971 | [9]
Remaining Retention, Net | 161,544 | [9]
Bellemeade 2020-3 Ltd | Funded By VIE |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 418,000 |
Bellemeade 2020-3 Ltd | Directly provided capacity |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 34,000 |
Bellemeade 2020-4 Ltd |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 337,013 | [10]
Current Coverage | 101,729 | [10]
Remaining Retention, Net | 138,131 | [10]
Bellemeade 2020-4 Ltd | Funded By VIE |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 321,000 |
Bellemeade 2020-4 Ltd | Directly provided capacity |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 16,000 |
Bellemeade 2021-1 Ltd Member |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 643,577 | [11]
Current Coverage | 503,267 | [11]
Remaining Retention, Net | 153,525 | [11]
Bellemeade 2021-1 Ltd Member | Funded By VIE |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 580,000 |
Bellemeade 2021-1 Ltd Member | Directly provided capacity |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 64,000 |
Bellemeade 2021-2 Ltd |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 616,017 | [12]
Current Coverage | 535,461 | [12]
Remaining Retention, Net | 138,524 | [12]
Bellemeade 2021-2 Ltd | Funded By VIE |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 523,000 |
Bellemeade 2021-2 Ltd | Directly provided capacity |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 93,000 |
Bellemeade 2021-3 Ltd |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 639,391 | [13]
Current Coverage | 616,959 | [13]
Remaining Retention, Net | 132,492 | [13]
Bellemeade 2021-3 Ltd | Funded By VIE |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 508,000 |
Bellemeade 2021-3 Ltd | Directly provided capacity |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 131,000 |
Bellemeade 2022-01 Ltd |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 316,760 | [14]
Current Coverage | 316,760 | [14]
Remaining Retention, Net | 143,577 | [14]
Bellemeade 2022-01 Ltd | Funded By VIE |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 284,000 |
Bellemeade 2022-01 Ltd | Directly provided capacity |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 33,000 |
Bellemeade 2022-2 Ltd |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 327,165 | [15]
Current Coverage | 327,165 | [15]
Remaining Retention, Net | 217,436 | [15]
Bellemeade 2022-2 Ltd | Funded By VIE |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | 201,000 |
Bellemeade 2022-2 Ltd | Directly provided capacity |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage at Issuance | $ 126,000 |
[1] | Issued in October 2017, covering in-force policies issued between January 1, 2017 and June 30, 2017.
[2] | Issued in April 2018, covering in-force policies issued between July 1, 2017 and December 31, 2017.
[3] | Issued in October 2018, covering in-force policies issued between January 1, 2018 and June 30, 2018.
[4] | Issued in March 2019, covering in-force policies primarily issued between 2005 to 2008 under United Guaranty Residential Insurance Company (“UGRIC”); as well as policies issued through 2015 under both UGRIC and Arch Mortgage Insurance Company.
[5] | Issued in April 2019, covering in-force policies issued between July 1, 2018 and December 31, 2018.
[6] | Issued in July 2019, covering in-force policies issued in 2016.
[7] | Issued in October 2019, covering in-force policies issued between January 1, 2019 and June 30, 2019.
[8] | Issued in September 2020, covering in-force policies issued between January 1, 2020 and May 31, 2020. $423 million was directly funded by Bellemeade 2020-2 Ltd. with an additional $26 million of capacity provided directly to Arch MI U.S. by a separate panel of reinsurers
[9] | Issued in November 2020, covering in-force policies issued between June 1, 2020 and August 31, 2020. $418 million was directly funded by Bellemeade 2020-3 Ltd. with an additional $34 million of capacity provided directly to Arch MI U.S. by a separate panel of reinsurers.
[10] | Issued in December 2020, covering in-force policies issued between July 1, 2019 and December 31, 2019. $321 million was directly funded by Bellemeade 2020-4 Ltd. with an additional $16 million of capacity provided directly to Arch MI U.S. by a separate panel of reinsurers
[11] | Issued in March 2021, covering in-force policies issued between September 1, 2020 and November 30, 2020. $580 million was directly funded by Bellemeade Re 2021-1 Ltd. with an additional $64 million capacity provided directly to Arch MI U.S. by a separate panel of reinsurers.
[12] | Issued in June 2021, covering in-force policies issued between December 1, 2020 and March 31, 2021. $523 million was directly funded by Bellemeade Re 2021-2 Ltd. via insurance-linked notes, with an additional $93 million capacity provided directly to Arch MI U.S. by a separate panel of reinsurers
[13] | Issued in September 2021, covering in-force policies issued between April 1, 2021 and June 30, 2021. $508 million was directly funded by Bellemeade Re 2021-3 Ltd. via insurance-linked notes, with an additional $131 million capacity provided directly to Arch MI U.S. by a separate panel of reinsurers
[14] | Issued in January 2022, covering in-force policies issued between July 1, 2021 and November 30, 2021. $284 million was directly funded by Bellemeade Re 2022-1 Ltd. via insurance-linked notes, with an additional $33 million capacity provided directly to Arch MI U.S. by a separate panel of reinsurers.
[15] | Issued in September 2022, covering in-force policies issued between November 1, 2021 and June 30, 2022. $201 million was directly funded by Bellemeade Re 2022-2 Ltd. via insurance-linked notes, with an additional $126 million capacity provided directly to Arch MI U.S. by a separate panel of reinsurers

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