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Variable Interest Entities and Noncontrolling Interests - Other variable interest entity disclosures (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets |  | $ 46,481,886 |  | $ 43,282,297
Maximum Exposure to Loss, Total |  | 2,721,384 |  | 2,232,609
Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets |  | 4,446,266 |  | 3,859,058
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (7,776) |  | (7,969)
Maximum Exposure to Loss - Off-Balance Sheet |  | 59,085 |  | 56,320
Maximum Exposure to Loss, Total |  | 51,309 |  | 48,351
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2017-1 Ltd. (Oct-17) |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets |  | 145,573 |  | 145,573
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (283) |  | (245)
Maximum Exposure to Loss - Off-Balance Sheet |  | 779 |  | 844
Maximum Exposure to Loss, Total |  | 496 |  | 599
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2018-1 Ltd. (Apr-18) |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets |  | 250,095 |  | 250,095
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (909) |  | (903)
Maximum Exposure to Loss - Off-Balance Sheet |  | 1,984 |  | 2,245
Maximum Exposure to Loss, Total |  | 1,075 |  | 1,342
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2018-2 Ltd. (Aug-18) |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets |  | 0 |  | 108,395
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | 0 |  | (138)
Maximum Exposure to Loss - Off-Balance Sheet |  | 0 |  | 280
Maximum Exposure to Loss, Total |  | 0 |  | 142
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2018-3 Ltd. (Oct-18) |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets |  | 302,563 |  | 302,563
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (1,622) |  | (1,320)
Maximum Exposure to Loss - Off-Balance Sheet |  | 3,706 |  | 3,262
Maximum Exposure to Loss, Total |  | 2,084 |  | 1,942
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2019-1 Ltd. (Mar-19) |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets |  | 219,256 |  | 219,256
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (1,237) |  | (1,361)
Maximum Exposure to Loss - Off-Balance Sheet |  | 8,204 |  | 8,461
Maximum Exposure to Loss, Total |  | 6,967 |  | 7,100
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2019-2 Ltd. (Apr-19) |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets |  | 398,316 |  | 398,316
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (1,042) |  | (730)
Maximum Exposure to Loss - Off-Balance Sheet |  | 6,723 |  | 5,201
Maximum Exposure to Loss, Total |  | 5,681 |  | 4,471
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2019-3 Ltd. (Jul-19) |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets |  | 528,084 |  | 528,084
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (969) |  | (861)
Maximum Exposure to Loss - Off-Balance Sheet |  | 4,527 |  | 5,079
Maximum Exposure to Loss, Total |  | 3,558 |  | 4,218
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2019-4 Ltd. (Oct-19) |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets |  | 468,737 |  | 468,737
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (1,051) |  | (890)
Maximum Exposure to Loss - Off-Balance Sheet |  | 7,128 |  | 6,676
Maximum Exposure to Loss, Total |  | 6,077 |  | 5,786
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2020-1 Ltd. (Jun-20) |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets | [1] | 18,843 |  | 275,068
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability | [1] | 0 |  | (178)
Maximum Exposure to Loss - Off-Balance Sheet | [1] | 0 |  | 1,012
Maximum Exposure to Loss, Total | [1] | 0 |  | 834
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2020-1 Ltd. (Jun-20) | Funded by directly provided capacity |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Initial Coverage, Amount |  | 79,000 |  |
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2020-2 Ltd (Sep-20) |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets | [2] | 325,712 |  | 423,420
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability | [2] | (442) |  | (556)
Maximum Exposure to Loss - Off-Balance Sheet | [2] | 4,299 |  | 6,839
Maximum Exposure to Loss, Total | [2] | 3,857 |  | 6,283
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2020-2 Ltd (Sep-20) | Funded by directly provided capacity |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Initial Coverage, Amount |  | 26,000 |  |
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2020-3 Ltd. (Nov-20) |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets | [3] | 418,158 |  | 418,158
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability | [3] | (618) |  | (631)
Maximum Exposure to Loss - Off-Balance Sheet | [3] | 8,250 |  | 9,605
Maximum Exposure to Loss, Total | [3] | 7,632 |  | 8,974
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2020-3 Ltd. (Nov-20) | Funded by directly provided capacity |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Initial Coverage, Amount |  | 34,000 |  |
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2020-4 Ltd. (Dec-20) |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets | [4] | 268,405 |  | 321,393
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability | [4] | (150) |  | (156)
Maximum Exposure to Loss - Off-Balance Sheet | [4] | 3,891 |  | 6,816
Maximum Exposure to Loss, Total | [4] | 3,741 |  | 6,660
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2020-4 Ltd. (Dec-20) | Funded by directly provided capacity |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Initial Coverage, Amount |  | 16,000 |  |
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2021-1 Ltd. (Mar-21) |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets |  | 579,717 | [5] | 0
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (83) | [5] | 0
Maximum Exposure to Loss - Off-Balance Sheet |  | 4,387 | [5] | 0
Maximum Exposure to Loss, Total |  | 4,304 | [5] | 0
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2021-1 Ltd. (Mar-21) | Funded by directly provided capacity |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Initial Coverage, Amount |  | 64,000 |  |
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2021-2 Ltd. (Jun-21) |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets |  | 522,807 | [6] | 0
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | 630 | [6] | 0
Maximum Exposure to Loss - Off-Balance Sheet |  | 5,207 | [6] | 0
Maximum Exposure to Loss, Total |  | 5,837 |  | $ 0
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2021-2 Ltd. (Jun-21) | Funded by directly provided capacity |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Initial Coverage, Amount |  | $ 93,000 |  |
[1] | An additional $79 million capacity was provided directly to Arch MI U.S. by a separate panel of reinsurers and is not reflected in this table
[2] | An additional $26 million capacity was provided directly to Arch MI U.S. by a separate panel of reinsurers and is not reflected in this table.
[3] | An additional $34 million capacity was provided directly to Arch MI U.S. by a separate panel of reinsurers and is not reflected in this table.
[4] | An additional $16 million capacity was provided directly to Arch MI U.S. by a separate panel of reinsurers and is not reflected in this table.
[5] | An additional $64 million capacity was provided directly to Arch MI U.S. by a separate panel of reinsurers and is not reflected in this table
[6] | An additional $93 million capacity was provided directly to Arch MI U.S. by a separate panel of reinsurers and is not reflected in this table.

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