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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ASU Adoptions (Details) - USD ($) $ in Thousands	Oct. 01, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Loans and Leases Receivable Disclosure [Line Items]
Total loans and leases		$ 3,322,765	$ 3,658,847
Allowance for loan and lease losses		56,188	29,149	$ 13,040	$ 7,534
Retained earnings		$ 234,927	$ 252,813
Minimum | Accounting Standards Update 2016-13 | Subsequent Event | Forecast
Loans and Leases Receivable Disclosure [Line Items]
Allowance for loan and lease losses	$ 12,000
Liability for off-balance sheet credit exposures	800
Minimum | Adjustment | Accounting Standards Update 2016-13 | Subsequent Event | Forecast
Loans and Leases Receivable Disclosure [Line Items]
Retained earnings	(10,000)
Maximum | Accounting Standards Update 2016-13 | Subsequent Event | Forecast
Loans and Leases Receivable Disclosure [Line Items]
Allowance for loan and lease losses	13,000
Liability for off-balance sheet credit exposures	900
Maximum | Adjustment | Accounting Standards Update 2016-13 | Subsequent Event | Forecast
Loans and Leases Receivable Disclosure [Line Items]
Retained earnings	$ (11,000)

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