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Investment Fair Value Changes, Net - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Loans and Securities Sales and Derivative Settlement
Investment Holdings [Line Items]
Investment fair value changes, net	$ 274,000
Investment Fair Value Changes, Net | Trading securities
Investment Holdings [Line Items]
Investment fair value changes, net	129,000
Investment Fair Value Changes, Net | Freddie Mac K-Series
Investment Holdings [Line Items]
Investment fair value changes, net	72,000
Investment Fair Value Changes, Net | Risk management derivatives, net
Investment Holdings [Line Items]
Investment fair value changes, net	59,000
Asset and Liability Continually Held
Investment Holdings [Line Items]
Investment fair value changes, net	$ 597,000

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