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Interest Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest receivable | $ 53,799 | $ 48,857
Loans receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest receivable | 48,704 | 41,429
Mortgage-backed securities |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest receivable | 3,071 | 6,107
Investment securities |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest receivable | $ 2,024 | $ 1,321

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