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Interest Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest receivable | $ 48,857 | $ 47,295
Loans receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest receivable | 41,429 | 39,176
Mortgage-backed securities |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest receivable | 6,107 | 6,404
Investment securities |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest receivable | $ 1,321 | $ 1,715

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