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LOANS AND LEASES, NET - Troubled Debt Restructured Loans (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) loan | Mar. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2018 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Foreclosed real estate and repossessed assets | $ 29,548 |  | $ 29,548 |  | $ 31,638
Loans Receivable |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
TDRs number of contracts | loan | 0 |  |  |  |
TDRs recorded investment |  | $ 2,600 | 100 | $ 3,800 |
TDRs subsequent default, recorded investment |  |  | 900 | $ 100 |
Financing Receivable |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
TDRs recorded investment | $ 1,500 |  | $ 1,600 |  |

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