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Summary of Significant Accounting Policies (Repurchase Agreements) (Details)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Repurchase financing period, low end of range	1 month
Repurchase financing period, high end of range	6 months
Repurchase agreements financing collateralized, period, low end	3 months
Repurchase agreements financing collateralized, period, high end	12 months