LOANS AND LEASES RECEIVABLE, NET - Summary of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans and leases receivable	$ 2,944,989	$ 1,326,832
Less:
Allowance for Loan Losses	(13,040)	(7,534)
Net Deferred Loan Origination Fees	(250)	(1,461)
Total Loans Receivable, Net	2,931,699	1,317,837
National Lending [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans and leases receivable	1,846,283	395,729
National Lending [Member] \| Commercial Operating [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans and leases receivable	1,509,849	255,308
National Lending [Member] \| Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans and leases receivable	335,361	140,229
National Lending [Member] \| Tax Services [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans and leases receivable	1,073	192
Community Banking [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans and leases receivable	1,098,706	931,103
Community Banking [Member] \| Commercial Operating [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans and leases receivable	42,311	30,718
Community Banking [Member] \| Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans and leases receivable	23,836	22,775
Community Banking [Member] \| Commercial and Multi-Family Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans and leases receivable	748,579	585,510
Community Banking [Member] \| 1-4 Family Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans and leases receivable	223,482	196,706
Community Banking [Member] \| Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans and leases receivable	$ 60,498	$ 95,394

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount, before allowance and fees, of loans and leases receivable. Excludes loans and leases covered under loss sharing agreements.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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