Investments Significant Inputs on PLRMBS (Details)	3 Months Ended
	Mar. 31, 2020
Significant Inputs on PLRMBS [Line Items]
Prepayment Weighted Average	15.00%
Default Rate Weighted Average	16.00%
Loss Severity Weighted Average	40.60%
Alt-A | Residential Mortgage Backed Securities [Member]
Significant Inputs on PLRMBS [Line Items]
Prepayment Weighted Average	15.00%
Default Rate Weighted Average	16.10%
Loss Severity Weighted Average	40.30%
Prime | Residential Mortgage Backed Securities [Member]
Significant Inputs on PLRMBS [Line Items]
Prepayment Weighted Average	16.30%
Default Rate Weighted Average	11.20%
Loss Severity Weighted Average	54.10%