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Basis of Presentation and Significant Accounting Policies, Credit Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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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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