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Interest Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest receivable | $ 50,636 | $ 53,799
Loans receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest receivable | 46,234 | 48,704
Mortgage-backed securities |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest receivable | 2,159 | 3,071
Investment securities |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest receivable | $ 2,243 | $ 2,024

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