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Subsequent Events (Details) - USD ($)	1 Months Ended
	Oct. 26, 2020	Sep. 30, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Principal balance		$ 6,476,313,000	$ 6,375,093,000
Subsequent Event
Subsequent Event [Line Items]
Funded amount of mortgages	$ 33,000,000.0
Proceeds from loan repayments	1,300,000
Payments and proceeds received on securities	25,000,000.0
Debt Securities, Available-for-sale	110,000,000.0
Subsequent Event | Urban Predevelopment - Miami, FL
Subsequent Event [Line Items]
Principal balance	$ 180,000,000.0

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