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Basis of Presentation and Significant Accounting Policies, Credit Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Basis of Presentation and Significant Accounting Policies
Increase to accumulated deficit	$ 12,084	$ 63,442
Allowance for credit losses:
Securities held-to-maturity, net	114,696	95,524
Liabilities:
Allowance for loss-sharing obligations	$ 65,645	$ 64,303

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Carrying amount of allowance for loss sharing obligations as at the balance sheet date.

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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