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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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Number of financing receivables that have been modified by troubled debt restructurings.

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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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