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v3.21.1

Fair Value of Financial Assets and Liabilities: (Details) | 12 Months Ended
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Dec. 31, 2020
Fair Value of Financial Assets and Liabilities: (Details) [Line Items] |
financial instruments to domestic issuers | 100.00%
Level 3 [Member] |
Fair Value of Financial Assets and Liabilities: (Details) [Line Items] |
Instruments, percentage | 100.00%

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