Reinsurance - Quota Share Agreement Terms (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
2020 QSR and 2021 QSR - 2021 NIW
Effects of Reinsurance [Line Items]
Quota Share %		17.50%
Annual Loss Ratio to Exhaust Profit Commission		61.90%
Cede rate, option 1		14.50%
Cede rate, option 2		12.00%
2021 QSR and 2022 QSR - 2021 NIW
Effects of Reinsurance [Line Items]
Quota Share %		12.50%
Annual Loss Ratio to Exhaust Profit Commission		57.50%
Cede rate, option 1		10.50%
Cede rate, option 2		8.00%
2021 QSR and 2022 QSR - 2022 NIW
Effects of Reinsurance [Line Items]
Quota Share %		15.00%
Annual Loss Ratio to Exhaust Profit Commission		57.50%
Cede rate, option 1		12.50%
Cede rate, option 2		10.00%
2022 QSR and 2023 QSR - 2022 NIW
Effects of Reinsurance [Line Items]
Quota Share %		15.00%
Annual Loss Ratio to Exhaust Profit Commission		62.00%
Cede rate, option 1		12.50%
Cede rate, option 2		10.00%
2022 QSR and 2023 QSR - 2023 NIW
Effects of Reinsurance [Line Items]
Quota Share %		15.00%
Annual Loss Ratio to Exhaust Profit Commission		62.00%
Cede rate, option 1		12.50%
Cede rate, option 2		10.00%
QSR 2023 - 2023 NIW
Effects of Reinsurance [Line Items]
Quota Share %		10.00%
Annual Loss Ratio to Exhaust Profit Commission		58.50%
Cede rate, option 1		8.00%
Cede rate, option 2		7.00%
Credit Union QSR Transaction
Effects of Reinsurance [Line Items]
Quota Share %		65.00%
Annual Loss Ratio to Exhaust Profit Commission		50.00%
QSR 2024 - 2024 NIW | Forecast
Effects of Reinsurance [Line Items]
Quota Share %	30.00%
Annual Loss Ratio to Exhaust Profit Commission	56.00%