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Reinsurance - Coverage and retention (Details) - Variable Interest Entity, Not Primary Beneficiary
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance $ 5,909,497
Current Coverage 3,967,473
Remaining Retention, Net $ 2,576,354
Amortization period ten
Bellemeade 2017-1 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance $ 368,114 [1]
Current Coverage 145,573 [1]
Remaining Retention, Net 125,953 [1]
Bellemeade 2018-1 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 374,460 [2]
Current Coverage 250,095 [2]
Remaining Retention, Net 123,690 [2]
Bellemeade 2018-2 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 653,278 [3]
Current Coverage 108,395 [3]
Remaining Retention, Net 305,606 [3]
Bellemeade 2018-3 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 506,110 [4]
Current Coverage 302,563 [4]
Remaining Retention, Net 129,874 [4]
Bellemeade 2019-1 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 341,790 [5]
Current Coverage 219,256 [5]
Remaining Retention, Net 116,530 [5]
Bellemeade 2019-2 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 621,022 [6]
Current Coverage 398,316 [6]
Remaining Retention, Net 162,457 [6]
Bellemeade 2019-3 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 700,920 [7]
Current Coverage 528,084 [7]
Remaining Retention, Net 181,036 [7]
Bellemeade 2019-4 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 577,267 [8]
Current Coverage 468,737 [8]
Remaining Retention, Net 118,102 [8]
Bellemeade 2020-1 Ltd.  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 528,540 [9]
Current Coverage 308,458 [9]
Remaining Retention, Net 754,782 [9]
Bellemeade 2020-2 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 449,167 [10]
Current Coverage 449,167 [10]
Remaining Retention, Net 239,278 [10]
Bellemeade 2020-3 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 451,816 [11]
Current Coverage 451,816 [11]
Remaining Retention, Net 171,580 [11]
Bellemeade 2020-4 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 337,013 [12]
Current Coverage 337,013 [12]
Remaining Retention, Net 147,466 [12]
Funded By VIE | Bellemeade 2020-1 Ltd.  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 450,000
Funded By VIE | Bellemeade 2020-2 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 423,000
Funded By VIE | Bellemeade 2020-3 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 418,000
Funded By VIE | Bellemeade 2020-4 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 321,000
Directly provided capacity | Bellemeade 2020-1 Ltd.  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 79,000
Directly provided capacity | Bellemeade 2020-2 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 26,000
Directly provided capacity | Bellemeade 2020-3 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 34,000
Directly provided capacity | Bellemeade 2020-4 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance $ 16,000
[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 August 2018, covering in-force policies issued between April 1, 2013 and December 31, 2015.
[4] Issued in October 2018, covering in-force policies issued between January 1, 2018 and June 30, 2018.
[5] 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.
[6] Issued in April 2019, covering in-force policies issued between July 1, 2018 and December 31, 2018.
[7] Issued in July 2019, covering in-force policies issued in 2016.
[8] Issued in October 2019, covering in-force policies issued between January 1, 2019 and June 30, 2019.
[9] Issued in June 2020, covering in-force policies issued between July 1, 2019 and December 31, 2019. $450 million was directly funded by Bellemeade 2020-1 Ltd. with an additional $79 million of capacity provided directly to Arch MI U.S. by a separate panel of reinsurers
[10] 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
[11] 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.
[12] 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