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Interest Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest receivable | $ 47,295 | $ 41,643
Loans receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest receivable | 39,176 | 33,688
Mortgage-backed securities |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest receivable | 6,404 | 6,049
Investment securities |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest receivable | $ 1,715 | $ 1,906

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