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Schedule IV Reinsurance (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Amount |  |  |  |  |  |  |  |  | $ 1,286,527,000 | $ 1,244,870,000 | $ 1,074,298,000
Ceded to Other Companies |  |  |  |  |  |  |  |  | 183,419,000 | 109,903,000 | 67,195,000
Assumed from Other Companies |  |  |  |  |  |  |  |  | 12,213,000 | 10,382,000 | 6,904,000
Net Amount | $ 302,140,000 | $ 286,471,000 | $ 249,295,000 | $ 277,415,000 | $ 301,486,000 | $ 281,185,000 | $ 299,166,000 | $ 263,512,000 | $ 1,115,321,000 | $ 1,145,349,000 | $ 1,014,007,000
Assumed Premium as a Percentage of Net Premiums |  |  |  |  |  |  |  |  | 1.10% | 0.91% | 0.68%
Mortgage Insurance |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Amount |  |  |  |  |  |  |  |  | $ 1,263,684,000 | $ 1,233,528,000 | $ 1,066,860,000
Ceded to Other Companies |  |  |  |  |  |  |  |  | 183,130,000 | 109,696,000 | 67,047,000
Assumed from Other Companies |  |  |  |  |  |  |  |  | 12,213,000 | 10,382,000 | 6,904,000
Net Amount |  |  |  |  |  |  |  |  | $ 1,092,767,000 | $ 1,134,214,000 | $ 1,006,717,000
Assumed Premium as a Percentage of Net Premiums |  |  |  |  |  |  |  |  | 1.12% | 0.92% | 0.69%
Title Insurance |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Amount |  |  |  |  |  |  |  |  | $ 22,843,000 | $ 11,342,000 | $ 7,438,000
Ceded to Other Companies |  |  |  |  |  |  |  |  | 289,000 | 207,000 | 148,000
Assumed from Other Companies |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Amount |  |  |  |  |  |  |  |  | $ 22,554,000 | $ 11,135,000 | $ 7,290,000
Assumed Premium as a Percentage of Net Premiums |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00%

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