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Investments Investments (Aggregate Carrying And Approximate Market Values of Marketable and Non-Marketable Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
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Schedule of Investments [Line Items] |  |
Other Investments and Securities, at Cost | $ 28,875 | $ 14,147
Other Investment Not Readily Marketable, Fair Value | 28,875 | 14,147
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Owned Not Readily Marketable | 17,316 | 14,147
Security Owned Not Readily Marketable, Fair Value | 17,316 | $ 14,147
Equity Securities |  |
Schedule of Investments [Line Items] |  |
Equity Securities, FV-NI, Cost | 11,559 |
Equity Securities, FV-NI | $ 11,559 |

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