Reinsurance - Quota Share Agreement Terms (Details)		12 Months Ended
	Dec. 31, 2024	Dec. 31, 2024
2020 QSR and 2021 QSR - 2021 NIW
Effects of Reinsurance [Line Items]
Quota Share %	14.80%	17.50%
Annual Loss Ratio to Exhaust Profit Commission	69.00%	61.90%
Cede rate, option 1		12.30%
Cede rate, option 2		10.00%
2021 QSR and 2022 QSR - 2021 NIW
Effects of Reinsurance [Line Items]
Quota Share %	11.10%	12.50%
Annual Loss Ratio to Exhaust Profit Commission	69.00%	57.50%
Cede rate, option 1		9.40%
Cede rate, option 2		7.00%
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%
QSR 2024 - 2024 NIW
Effects of Reinsurance [Line Items]
Quota Share %		30.00%
Annual Loss Ratio to Exhaust Profit Commission		56.00%
Cede rate, option 1		23.00%
Cede rate, option 2		15.00%
Credit Union QSR Transaction
Effects of Reinsurance [Line Items]
Quota Share %		65.00%
Annual Loss Ratio to Exhaust Profit Commission		50.00%