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MSRs: Summary of Loans serviced for Freddie Mac (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
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Transfers and Servicing [Abstract] |  |  |
Loans serviced for Freddie Mac, Principal amount | $ 358,173 | $ 340,308 | $ 331,494
Loans serviced for SBA, Principal amount | $ 697 | $ 319 |

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